8 ms·

Parable of the Polygons – a playable post on the shape of society

357 points by pyduan 12y ago

mempko 12y ago
Brilliant. What else can I add?
- aaronem 12y ago
  Substance.
  - mempko 12y ago
    reached maximum dillusion.
kaitai 12y ago
Beautiful! For the math and game theory links, make sure to go all the way to the bottom. The post is based off the work of Nobel Prize winner Thomas Schelling and the style is inspired by Bret Victor's Explorable Explanations. There's more in the post, of course.
mcherm 12y ago
I was surprised to find that this was partly done by the incomparable Vi Hart. But why should that have been a surprise: she has a distinctive knack for presenting mathematical concepts in a way that makes them understandable.
pyre 12y ago
On the third board (the first one with a slider), setting the bias to 100%, segregation stays under 10% (I've run it for a bit and the max was 8%). Obviously we need to tell everyone be act like "I'll move if less than 100% of my neighbours are like me"! ;)
- lisper 12y ago
  This is just because when a piece moves, the destination is random. If you allowed the bias to affect the choice of destination and not just the decision to move or stay put you'd get the result you expect.
  - TelmoMenezes 12y ago
    Right, but you can't demand more realism for the results you don't like and accept the conclusions for those you do like. For example, in a more realistic scenario people move for all sorts of reasons: leaving parent's house, changing jobs, marriage and divorce, etc. This stirring may lead to decreased segregation for slight decreases in bias, unlike what this more static model suggests.
    - lisper 12y ago
      This is not intended to be an accurate model of what actually happens in the real world. It's only supposed to test the hypothesis that minor but widespread individual bias can result in large-scale segregation.
      - aaronem 12y ago
        ...which is then treated, in the remainder of the text, as though it were an accurate model of what happens in the real world.
        vidarh 12y ago
        No, it is not. You may want to reread it. Including the part where they explicitly state that the real world is a lot more complex, and where they give references to more in depth treatments.
    - mehwoot 12y ago
      Right, but you can't demand more realism for the results you don't like and accept the conclusions for those you do like. The article is just showing why segregation is possible even if people have a very slight bias towards being near people like them. It doesn't prove this is the reason that any place is segregated, and it doesn't attempt to emulate every possible reason why a place would or would not be segregated. In fact, at the bottom of the article you can see it says Schelling's model is a convincing demonstration of how innocent-seeming rules can create very undesirable outcomes, but of course real-life situations are more complicated. You might enjoy taking a closer look at real data in reference to Schelling's model. W.A.V. Clark's 1991 paper Residential Preferences and Neighborhood Racial Segregation: A Test of the Schelling Segregation Model has a lot of interesting data in it. If you want more complete answers, look at that. This article is just demonstrating one concept.
- Gracana 12y ago
  You can get it up there if you move the slider in small increments and rearrange to a stable state each time. If you do too big a jump, it becomes too chaotic.
- neaanopri 12y ago
  There are far more boards which are mixed-up than boards which are segregated. There are only a few ways to segregate a board, but there are many many different arrangements, so the vast majority aren't segregated.
- saraid216 12y ago
  In the real world, the result would be a pogrom. It's happened plenty of times. The flaw of the model is that the polygons don't kill each other.
- ThrustVectoring 12y ago
  This is because everyone at the border moves away - both the majority and the minority. When the majority at the border moves away, that exposes more border to move into. Bias near 2/3rds segregates hard, since even in the presence of interlopers, the border gets defended.
JackC 12y ago
This is fantastic! We were just noticing how segregated our own neighborhood near Boston is, and wondering what drives that and what could be done about it. You can see the same thing all over the city -- neighborhoods that are much more white than average right next to neighborhoods that are much less white than average. Really interesting that this could be self-generated with very little bias (setting aside that there's definitely still some intentional housing discrimination in Boston). And really interesting that it could potentially be reversed if people started to avoid neighborhoods that are highly segregated in their "favor." I wonder if integration could be advertised as a benefit of certain properties on real estate sites like Zillow. What would happen if home listings had a "well integrated neighborhood" indicator for neighborhoods that have about the same racial balance as the larger area, the same way they have indicators for good schools and public transportation and so on? Would that be appealing to actual buyers the same way it's appealing to the Polygons in the model? The risk is that an index like that could be used to encourage segregation instead -- but I'm hopeful that, on average, we're better than that at this point. Here's one census map if you want to check out your neighborhood: http://www.socialexplorer.com/ http://www.socialexplorer.com/ You can show racial data under "Change Data." We also found it helpful to change "Show data by: Tract" to "Block group" (more fine-grained), and to use quantile cutpoints under the color palette menu.
- secstate 12y ago
  I think one of the problems with the "avoid neighborhoods with segregation" solution is that it's more or less the same idea as affirmative action. As soon as you choose not to rent an apartment because "there are too many white people and not enough black" you're effectively practising reverse racism. Living in rural Maine, I've watch the deleterious effect this has on a rural community as young white people flock to Portland or Boston looking for black people for their kids to grow up near. In the meantime, there are 20 other non-race related variables in your community that you're ignoring, like age, health, wealth, gender, sexual orientation, language, education, technological proclivity, Meyers-Briggs results etcetera and so forth. Race, while a dominant segregator in our society, is not he only one, nor, perhaps, the most pervasive here in 2014.
  - 12y ago
aetherson 12y ago
I enjoyed playing with the graphs and everything, but I question whether this model has much relevance to the real world. Is there a strong reason to believe that these effects would survive a model of "I want to move" that is not solely based on "too many people unlike me live near by" and/or "not enough people unlike me live near by"? Indeed, is there a strong reason to believe that a binary modality of "I'm happy/unhappy," (the post gestures in the direction of a third mode, "I'm neither happy nor unhappy," but in fact in their simulations that third mode is indistinguishable from "happy") is a good abstraction of people's moving decisions? The data paper they posted a link to suggests that there is unlikely to be an equilibrium, contra the message of this post. It seems like it's more an explanation of a mathematical model and a prescriptive political position, rather than a description of anything real in society.
- slipjack 12y ago
  Sociological studies have found this to happen pretty often. A (very readable) study of tipping points can be found in There Goes the Neighborhood (http://www.amazon.com/There-Goes-Neighborhood-Tensions-Neighborhoods/dp/0679724184 http://www.amazon.com/There-Goes-Neighborhood-Tensions-Neigh...).
- anigbrowl 12y ago
  Certainly it's a model but you can work up to more complex models. Check out NetLOGO, which comes with a huge library of simulations and a fairly friendly IDE for creating your own agent-based simulations.
  - aetherson 12y ago
    I think that as it's presented, the authors are suggesting that it's a model that is necessary and on some level sufficient to understand the dynamics of self-segregation in housing. They subtitle the post "This is a story of how harmless choices can make a harmful world." Reading it, I get the powerful impression that the authors think that this model has the basic answers for all self-segregation in housing. But obviously an even slightly more complicated model undermines many of their points. Like, they make a big deal of the idea that if you have a fairly high level of "shapism" and thus get a fairly segregated society, and then you lower the level of "shapsim," nothing changes unless you actively reverse your bias and move if your neighborhood is not diverse enough. But clearly people don't only ever move for diversity reasons. Sometimes you move because you got a job or a SO that's far away. Sometimes you move because you can afford more or less living space. Sometimes you move because you have a child now and want to get into a good school zone. Or whatever. And if your preferences are now, compared to when you last moved, more tolerant, that WILL reduce the level of segregation of your society. In fact, people probably move for economic or family reasons far MORE often than they move for diversity reasons. I mean, that's not a small difference from their model. It's one of their major points! That, once segregated, societies won't become less segregated unless people actively work on it. And, honestly, I don't think that the model holds at all unless you understand that people probably mostly use economic proxies for race over primarily making decisions based on race. For the most part, I don't think people are saying, "I don't want to move there, there's too many black people." They're saying, "I don't want to move there, it's too poor or too crime-ridden" or whatever. And yes, they may be exaggerating the extent to which it is poor or crime-ridden because they have internalized racist ideas about whether majority-black neighborhoods are poor or crime-ridden. But the point is, you can't really address this segregation by telling people to prefer mixed neighborhoods: you need to address the complex relationships of economics and race and how economic class affects neighborhoods and whatever.
Frozenlock 12y ago
It plays with many variables to show the consequences of these choices, but never questions the basic assumption that shapes are happier in a diverse environment. It then goes on to conclude "Demand diversity near you". I know what they try to accomplish, but I still think it's a dishonest (or at least incomplete) approach.
- PhasmaFelis 12y ago
  If you read the base assumption naively as "white people are happier with a certain fixed percentage of black people around," then yes, it sounds silly. I think what you should be taking away as the basic assumption is: all other things being equal, an integrated society is healthier than a segregated society.
- vidarh 12y ago
  The target is those of us who are for diversity, but who have not realised how hard it is to achieve and maintain diversity in the face of even tiny biases.
stared 12y ago
Wow! Not only an educational game about social diversity, but also: agent-based models, phase transitions, irreversible thermodynamics. And, last not least - cute shapes. I am definitely adding it to my educational game recs: https://hackpad.com/Science-based-games-J0X4MSberlM https://hackpad.com/Science-based-games-J0X4MSberlM
- notthemessiah 12y ago
  A few more interactive things to add to that list: Interactive tutorial on sequent calculus: http://logitext.mit.edu/logitext.fcgi/tutorial http://logitext.mit.edu/logitext.fcgi/tutorial Math and Physics applets, mostly on wave mechanics (Java) http://www.falstad.com/mathphysics.html http://www.falstad.com/mathphysics.html Ancient Greek Geometry http://sciencevsmagic.net/geo/ http://sciencevsmagic.net/geo/ Dragonbox (iPhone game to teach algebra to kids) http://archive.wired.com/geekdad/2012/06/dragonbox/ http://archive.wired.com/geekdad/2012/06/dragonbox/
  - stared 12y ago
    Thanks! However, in this list I tried to focus on actual games: - capturing parts of a real scientific phenomena, - AND actually playable (you can play for fun, not "for classroom only"). [OK, maybe "Parable..." is here a stretch, but I could not resist adding it.] (And, for example consider Falstad's applets as one of my biggest inspirations ever - especially the Ripple Tank and the 1D Quantum Mechanics; but also electric circuits are very nice, and inspired things like iCircuit!)
- TeMPOraL 12y ago
  Thanks for sharing the list; I'm saving it and will check out some of those games after work! However, I'm a bit surprised that Kerbal Space Program didn't make it. It's extremely fun and playable, and captures the "parts of real scientific phenomena" known as orbital mechanics (orbiting, docking, landing, interplanetary transfers, etc.), aerodynamics (at least with FAR mod) and bits of structural engineering (aka. how to make rockets that don't tip over or disassemble themselves upon launch). Yesterday I spent like 3 hours figuring out how to assemble a skycrane and then used it to land a rover on the moon ;). Another thing that maybe could fit on that list is "Fate of the World" game from few years ago, in which you play as international government to fix climate change, world hunger, poverty, lack of education, etc. Sadly, it doesn't seem to be updated or to have any active community around it.
aaronem 12y ago
> it's about deciding what we want the world to look like, and settling for no less Perhaps it's about accepting people for who and what they are, even when they fail to satisfy your own biases, and building an understanding of the social world on that basis -- rather than being about privileging your opinion of how the world ought to be over your perception of how the world is, and bridging the gap between there and your thesis via the post hoc fallacy. ...nah. That would be stupid.
- kenferry 12y ago
  …what?
- saraid216 12y ago
  What biases are you disagreeing with, here?
PhasmaFelis 12y ago
I wanted to point out one of their conclusions in particular: > 1. Small individual bias → Large collective bias. > When someone says a culture is shapist, they're not saying the individuals in it are shapist. They're not attacking you personally. This is a really important point that gets a lot of arguments hung up on nonproductive "not all men"-type fooforaw lately. If someone says that e.g. gamer culture is sexist, or even if they (perhaps inadvisably) use shorthand and say "gamers are sexist," they are not saying that I and every other single person who plays games is personally sexist.
- saraid216 12y ago
  Yeah, one of the first things I noticed was that while the obvious analogy was race in a neighborhood, there was another fairly easy analogy for gender in a workplace.
- yarrel 12y ago
  They are saying that, and they are acting like that. Asking people to agree that they are not is simply a shibboleth.
  - PhasmaFelis 12y ago
    > They are saying that, and they are acting like that. This is trivially false, since most of the people saying that gamer culture is sexist are themselves gamers.
kaoD 12y ago
That last sandbox taught me very small minorities make everyone unhappy.
mdesq 12y ago
I wonder how we could maybe put this idea to work as part of immigration reform or the much-discussed work visa topic. After all, moving is tough so not everyone can just up and move for diversity's sake, but if someone is already moving, maybe a requirement should be that they move to communities unlike them?
- deleted 12y ago
  [deleted]
davekinkead 12y ago
Beautiful UI. Schelling's models of segregation is a great example of how simulation and data-vis can create insights in the humanities & social sciences. I made a similar (though much less beautiful) simulation for a workshop in in computational philosophy last semester - but replaced intentional with random movement when uphappy. http://dave.kinkead.com.au/models-of-segregation/ http://dave.kinkead.com.au/models-of-segregation/
phkahler 12y ago
Problem with this model. If you turn the bias way up (demand 80-90 percent of your neighbors be like you) the segregation drops to zero. That doesn't seem to make sense and I think it's because they're moving to random locations that have low probability of being "better" by the binary nature of the metric.
- michaelochurch 12y ago
  Right. If you make them super-racist, you get a chaotic state because the polygons move around constantly. I don't see it as a problem with the model. I think that it makes sense, because people who are extremely racist are (in addition to being morally in the wrong) impractical and chronically pissed off. However, you can get a very-segregated state by gradually turning up the racism (from 33% to 50%, then to 60%, then 70%). If you do it too fast (i.e. change the racist temperature too quickly) you get the chaotic state you're talking about. In the real world, this chaotic effect might be a negative (i.e. violent) interaction. Or, more hopefully, people might recognize such extreme bias as untenable and gradually find it undesirable to live in monoculture. By the way, I was able to get 99% (ETA: 100%) segregation (because engineering racist dystopias is the point of this exercise? :) ) by altering the racism level to move around the patches and "attack" small enclaves of blue in the yellow area. If you think of it as abstractly playing with optimization parameters with a hand-controllable Lagrange multiplier, it feels less evil.
raldi 12y ago
Are mobile devices supported? I can't make the page do anything.
michaelochurch 12y ago
There are many settings for which this process doesn't converge. I consider it a feature rather than a bug. For example, if you have the parameters at 33% and 100%, you converge on a racist/segregated state. However, at 33% and 95%, people keep moving around. You see the large contiguous regions that would otherwise be suburban enclaves hollow out. But you never get to a stable state, which is kinda like real life so it works. Small individual bias → Large collective bias. This is so incredibly true. I wrote about this. The blog post is specific to VCs, but I think the Racist Judges Problem is much more general. (http://michaelochurch.wordpress.com/2013/10/08/vc-istan-2-the-racist-judges-problem/ http://michaelochurch.wordpress.com/2013/10/08/vc-istan-2-th...) Let's say that we're having a cat beauty contest and, for the sake of argument and egregious simplification, that 35 states are completely non-racist and 15 states are extremely racist against orange cats. Let's also assume that beauty is uncorrelated to kitty-race and that there are only two colors: white (80%) and orange (20%). You'd expect that 7 contestants would be orange: a proportionate share from the non-racist states and none from the racist states. But you'll actually get very few, because the non-racist states still want their cats to win, so they'll be de facto racist for strategic reasons except for an occasional "weird" state (say, Minnesota) that nominates an orange cat and Fox News doesn't shut up about it being "political" in its "making a statement" (even if the orange cat from Minnesota was the most beautiful). Thus, when you look at the contestants and see 49-50 white cats, it creates a horrible and completely false perception that white is the standard of cat beauty and that no one finds orange cats beautiful. In other words, small differences in preference, once they gain a certain social currency and acceptability, snowball into something a lot more horrible. This is also why it's so important to keep racism socially unacceptable, and why Stetson Kennedy's infiltration of the Ku Klux Klan (he exposed it as childish and ludicrous) was so powerful.
a3_nm 12y ago
Great post, though I'm missing a definition of how do they mathematically define segregation. (Checking from the JS code, it seems to be an average over the shapes of the proportion of neighbor shapes which are like them.) Also, the title confused me a bit as I expected something related to Flatland. By the way, one of the two people behind this is Vi Hart, which has also made some brilliant videos featuring math, music, and brilliant silliness: https://www.youtube.com/watch?v=4niz8TfY794&list=UUOGeU-1Fig3rrDjhm9Zs_wg https://www.youtube.com/watch?v=4niz8TfY794&list=UUOGeU-1Fig...
vidarh 12y ago
This one is incredibly fascinating, even though it is simplified. One thing to keep in mind is that even if you exclude racial biases, you will maintain segregation if people have other - correlated - biases or limitations on their ability to move: In many countries, poverty is highly correlated with race, for example. This is certainly the case with the US, but also elsewhere. I live in London, and you see interesting effects of this. The inner city boroughs are quite segregated, both by race and wealth. Meanwhile, some of the outer boroughs are showing the reverse effect, where property price points appears to be a driver for mixing. E.g. Croydon, where I live, is one of the most mixed in London - it's at a price point that creates both young professionals of all races, and more established families of all races who are united in finding the inner boroughs either too expensive or too poor. But overall: Imagine that nobody had a racial preference, but had a wealth preference - and limitations. Now to overcome segregation, you face a near insurmountable barrier: Wealthier people would need to be willing to settle for housing and an environment of a much worse standard than they can afford, and poorer people would be unable to find housing that makes much difference. This is one of the biggest problems. The recent US situation with demonstrations over police killings, the race aspect has been blown out of proportion: You don't solve anything by focusing on the race issue, because so much of the violence is correlated more strongly with poverty than with race. You want to solve racial issues, start by addressing poverty. You'll still have race issues at the end of it, but it will turn out vastly smaller than what it appears, and you'll have removed a substantial source of excuses for racial biases.
- Cthulhu_ 12y ago
  Matter of fact, at least over here (NL), people aren't even allowed to live in low-rent housing if they earn more - there's even a movement that wants to raise low-rent house prices if the people living in them are earning more than they did when they moved in. Of course, that is also so that the cheaper houses become available for people moving into a house of their own for the first time (young families). But at the same time it causes the wealth-based segregation as you state, with all the associated side-effects.
- mcv 12y ago
  > _"Wealthier people would need to be willing to settle for housing and an environment of a much worse standard than they can afford, and poorer people would be unable to find housing that makes much difference."_ That is actually very easy to manage: don't make all houses in a neighbourhood the same. Make some to the standards of wealthy people, and others to the budget of poor people. The apartment building I live in has some houses that are rentals, and others that are purchased. Some are bigger, others smaller. As a result, we've got reasonable diversity (though still whiter than the rest of the neighbourhood). Of course addressing poverty is still a good idea, for this and many other reasons.
perfunctory 12y ago
Sometimes it feels like the open source web development environment I find myself in is all triangles.
pja 12y ago
This is a fantastic visual demonstration of a simple, but surprising (if you haven't seen it before) effect! Congrats to Vi Hart & Nicky Case (I presume Nicky did the web/javascript side of things?). This isn't just about race / skin colour either - you can see exactly the same effects in things like political viewpoints where people also tend to segregate into areas or simply social circles of people that share their own preferences. (pace the praphrased quote: "How could politician X win the election? Nobody I know would vote for them!")
moron4hire 12y ago
What does it say that anything over 75-85% "segregationism" leads to an almost completely desegregated community of shapes over time (though, they are constantly moving)?
amenghra 12y ago
"I'll move if less than 97% of my neighbors are like me" leads to less segregation because everyone is always moving...

357 points by pyduan 12y ago

mempko 12y ago

Brilliant. What else can I add?

aaronem 12y ago
Substance.
- mempko 12y ago
  reached maximum dillusion.

kaitai 12y ago

Beautiful! For the math and game theory links, make sure to go all the way to the bottom. The post is based off the work of Nobel Prize winner Thomas Schelling and the style is inspired by Bret Victor's Explorable Explanations. There's more in the post, of course.

mcherm 12y ago

I was surprised to find that this was partly done by the incomparable Vi Hart. But why should that have been a surprise: she has a distinctive knack for presenting mathematical concepts in a way that makes them understandable.

pyre 12y ago

On the third board (the first one with a slider), setting the bias to 100%, segregation stays under 10% (I've run it for a bit and the max was 8%). Obviously we need to tell everyone be act like "I'll move if less than 100% of my neighbours are like me"! ;)

lisper 12y ago
This is just because when a piece moves, the destination is random. If you allowed the bias to affect the choice of destination and not just the decision to move or stay put you'd get the result you expect.
- TelmoMenezes 12y ago
  Right, but you can't demand more realism for the results you don't like and accept the conclusions for those you do like. For example, in a more realistic scenario people move for all sorts of reasons: leaving parent's house, changing jobs, marriage and divorce, etc. This stirring may lead to decreased segregation for slight decreases in bias, unlike what this more static model suggests.
  - lisper 12y ago
    This is not intended to be an accurate model of what actually happens in the real world. It's only supposed to test the hypothesis that minor but widespread individual bias can result in large-scale segregation.
    - aaronem 12y ago
      ...which is then treated, in the remainder of the text, as though it were an accurate model of what happens in the real world.
      - vidarh 12y ago
        No, it is not. You may want to reread it. Including the part where they explicitly state that the real world is a lot more complex, and where they give references to more in depth treatments.
  - mehwoot 12y ago
    Right, but you can't demand more realism for the results you don't like and accept the conclusions for those you do like. The article is just showing why segregation is possible even if people have a very slight bias towards being near people like them. It doesn't prove this is the reason that any place is segregated, and it doesn't attempt to emulate every possible reason why a place would or would not be segregated. In fact, at the bottom of the article you can see it says Schelling's model is a convincing demonstration of how innocent-seeming rules can create very undesirable outcomes, but of course real-life situations are more complicated. You might enjoy taking a closer look at real data in reference to Schelling's model. W.A.V. Clark's 1991 paper Residential Preferences and Neighborhood Racial Segregation: A Test of the Schelling Segregation Model has a lot of interesting data in it. If you want more complete answers, look at that. This article is just demonstrating one concept.
Gracana 12y ago
You can get it up there if you move the slider in small increments and rearrange to a stable state each time. If you do too big a jump, it becomes too chaotic.
neaanopri 12y ago
There are far more boards which are mixed-up than boards which are segregated. There are only a few ways to segregate a board, but there are many many different arrangements, so the vast majority aren't segregated.
saraid216 12y ago
In the real world, the result would be a pogrom. It's happened plenty of times. The flaw of the model is that the polygons don't kill each other.
ThrustVectoring 12y ago
This is because everyone at the border moves away - both the majority and the minority. When the majority at the border moves away, that exposes more border to move into. Bias near 2/3rds segregates hard, since even in the presence of interlopers, the border gets defended.

JackC 12y ago

This is fantastic! We were just noticing how segregated our own neighborhood near Boston is, and wondering what drives that and what could be done about it. You can see the same thing all over the city -- neighborhoods that are much more white than average right next to neighborhoods that are much less white than average. Really interesting that this could be self-generated with very little bias (setting aside that there's definitely still some intentional housing discrimination in Boston). And really interesting that it could potentially be reversed if people started to avoid neighborhoods that are highly segregated in their "favor." I wonder if integration could be advertised as a benefit of certain properties on real estate sites like Zillow. What would happen if home listings had a "well integrated neighborhood" indicator for neighborhoods that have about the same racial balance as the larger area, the same way they have indicators for good schools and public transportation and so on? Would that be appealing to actual buyers the same way it's appealing to the Polygons in the model? The risk is that an index like that could be used to encourage segregation instead -- but I'm hopeful that, on average, we're better than that at this point. Here's one census map if you want to check out your neighborhood: http://www.socialexplorer.com/ http://www.socialexplorer.com/ You can show racial data under "Change Data." We also found it helpful to change "Show data by: Tract" to "Block group" (more fine-grained), and to use quantile cutpoints under the color palette menu.

secstate 12y ago
I think one of the problems with the "avoid neighborhoods with segregation" solution is that it's more or less the same idea as affirmative action. As soon as you choose not to rent an apartment because "there are too many white people and not enough black" you're effectively practising reverse racism. Living in rural Maine, I've watch the deleterious effect this has on a rural community as young white people flock to Portland or Boston looking for black people for their kids to grow up near. In the meantime, there are 20 other non-race related variables in your community that you're ignoring, like age, health, wealth, gender, sexual orientation, language, education, technological proclivity, Meyers-Briggs results etcetera and so forth. Race, while a dominant segregator in our society, is not he only one, nor, perhaps, the most pervasive here in 2014.
- 12y ago

aetherson 12y ago

I enjoyed playing with the graphs and everything, but I question whether this model has much relevance to the real world. Is there a strong reason to believe that these effects would survive a model of "I want to move" that is not solely based on "too many people unlike me live near by" and/or "not enough people unlike me live near by"? Indeed, is there a strong reason to believe that a binary modality of "I'm happy/unhappy," (the post gestures in the direction of a third mode, "I'm neither happy nor unhappy," but in fact in their simulations that third mode is indistinguishable from "happy") is a good abstraction of people's moving decisions? The data paper they posted a link to suggests that there is unlikely to be an equilibrium, contra the message of this post. It seems like it's more an explanation of a mathematical model and a prescriptive political position, rather than a description of anything real in society.

slipjack 12y ago
Sociological studies have found this to happen pretty often. A (very readable) study of tipping points can be found in There Goes the Neighborhood (http://www.amazon.com/There-Goes-Neighborhood-Tensions-Neighborhoods/dp/0679724184 http://www.amazon.com/There-Goes-Neighborhood-Tensions-Neigh...).
anigbrowl 12y ago
Certainly it's a model but you can work up to more complex models. Check out NetLOGO, which comes with a huge library of simulations and a fairly friendly IDE for creating your own agent-based simulations.
- aetherson 12y ago
  I think that as it's presented, the authors are suggesting that it's a model that is necessary and on some level sufficient to understand the dynamics of self-segregation in housing. They subtitle the post "This is a story of how harmless choices can make a harmful world." Reading it, I get the powerful impression that the authors think that this model has the basic answers for all self-segregation in housing. But obviously an even slightly more complicated model undermines many of their points. Like, they make a big deal of the idea that if you have a fairly high level of "shapism" and thus get a fairly segregated society, and then you lower the level of "shapsim," nothing changes unless you actively reverse your bias and move if your neighborhood is not diverse enough. But clearly people don't only ever move for diversity reasons. Sometimes you move because you got a job or a SO that's far away. Sometimes you move because you can afford more or less living space. Sometimes you move because you have a child now and want to get into a good school zone. Or whatever. And if your preferences are now, compared to when you last moved, more tolerant, that WILL reduce the level of segregation of your society. In fact, people probably move for economic or family reasons far MORE often than they move for diversity reasons. I mean, that's not a small difference from their model. It's one of their major points! That, once segregated, societies won't become less segregated unless people actively work on it. And, honestly, I don't think that the model holds at all unless you understand that people probably mostly use economic proxies for race over primarily making decisions based on race. For the most part, I don't think people are saying, "I don't want to move there, there's too many black people." They're saying, "I don't want to move there, it's too poor or too crime-ridden" or whatever. And yes, they may be exaggerating the extent to which it is poor or crime-ridden because they have internalized racist ideas about whether majority-black neighborhoods are poor or crime-ridden. But the point is, you can't really address this segregation by telling people to prefer mixed neighborhoods: you need to address the complex relationships of economics and race and how economic class affects neighborhoods and whatever.

Frozenlock 12y ago

It plays with many variables to show the consequences of these choices, but never questions the basic assumption that shapes are happier in a diverse environment. It then goes on to conclude "Demand diversity near you". I know what they try to accomplish, but I still think it's a dishonest (or at least incomplete) approach.

PhasmaFelis 12y ago
If you read the base assumption naively as "white people are happier with a certain fixed percentage of black people around," then yes, it sounds silly. I think what you should be taking away as the basic assumption is: all other things being equal, an integrated society is healthier than a segregated society.
vidarh 12y ago
The target is those of us who are for diversity, but who have not realised how hard it is to achieve and maintain diversity in the face of even tiny biases.

stared 12y ago

Wow! Not only an educational game about social diversity, but also: agent-based models, phase transitions, irreversible thermodynamics. And, last not least - cute shapes. I am definitely adding it to my educational game recs: https://hackpad.com/Science-based-games-J0X4MSberlM https://hackpad.com/Science-based-games-J0X4MSberlM

notthemessiah 12y ago
A few more interactive things to add to that list: Interactive tutorial on sequent calculus: http://logitext.mit.edu/logitext.fcgi/tutorial http://logitext.mit.edu/logitext.fcgi/tutorial Math and Physics applets, mostly on wave mechanics (Java) http://www.falstad.com/mathphysics.html http://www.falstad.com/mathphysics.html Ancient Greek Geometry http://sciencevsmagic.net/geo/ http://sciencevsmagic.net/geo/ Dragonbox (iPhone game to teach algebra to kids) http://archive.wired.com/geekdad/2012/06/dragonbox/ http://archive.wired.com/geekdad/2012/06/dragonbox/
- stared 12y ago
  Thanks! However, in this list I tried to focus on actual games: - capturing parts of a real scientific phenomena, - AND actually playable (you can play for fun, not "for classroom only"). [OK, maybe "Parable..." is here a stretch, but I could not resist adding it.] (And, for example consider Falstad's applets as one of my biggest inspirations ever - especially the Ripple Tank and the 1D Quantum Mechanics; but also electric circuits are very nice, and inspired things like iCircuit!)
TeMPOraL 12y ago
Thanks for sharing the list; I'm saving it and will check out some of those games after work! However, I'm a bit surprised that Kerbal Space Program didn't make it. It's extremely fun and playable, and captures the "parts of real scientific phenomena" known as orbital mechanics (orbiting, docking, landing, interplanetary transfers, etc.), aerodynamics (at least with FAR mod) and bits of structural engineering (aka. how to make rockets that don't tip over or disassemble themselves upon launch). Yesterday I spent like 3 hours figuring out how to assemble a skycrane and then used it to land a rover on the moon ;). Another thing that maybe could fit on that list is "Fate of the World" game from few years ago, in which you play as international government to fix climate change, world hunger, poverty, lack of education, etc. Sadly, it doesn't seem to be updated or to have any active community around it.

aaronem 12y ago

> it's about deciding what we want the world to look like, and settling for no less Perhaps it's about accepting people for who and what they are, even when they fail to satisfy your own biases, and building an understanding of the social world on that basis -- rather than being about privileging your opinion of how the world ought to be over your perception of how the world is, and bridging the gap between there and your thesis via the post hoc fallacy. ...nah. That would be stupid.

kenferry 12y ago
…what?
saraid216 12y ago
What biases are you disagreeing with, here?

PhasmaFelis 12y ago

I wanted to point out one of their conclusions in particular: > 1. Small individual bias → Large collective bias. > When someone says a culture is shapist, they're not saying the individuals in it are shapist. They're not attacking you personally. This is a really important point that gets a lot of arguments hung up on nonproductive "not all men"-type fooforaw lately. If someone says that e.g. gamer culture is sexist, or even if they (perhaps inadvisably) use shorthand and say "gamers are sexist," they are not saying that I and every other single person who plays games is personally sexist.

saraid216 12y ago
Yeah, one of the first things I noticed was that while the obvious analogy was race in a neighborhood, there was another fairly easy analogy for gender in a workplace.
yarrel 12y ago
They are saying that, and they are acting like that. Asking people to agree that they are not is simply a shibboleth.
- PhasmaFelis 12y ago
  > They are saying that, and they are acting like that. This is trivially false, since most of the people saying that gamer culture is sexist are themselves gamers.

kaoD 12y ago

That last sandbox taught me very small minorities make everyone unhappy.

mdesq 12y ago

I wonder how we could maybe put this idea to work as part of immigration reform or the much-discussed work visa topic. After all, moving is tough so not everyone can just up and move for diversity's sake, but if someone is already moving, maybe a requirement should be that they move to communities unlike them?

deleted 12y ago
[deleted]

davekinkead 12y ago

Beautiful UI. Schelling's models of segregation is a great example of how simulation and data-vis can create insights in the humanities & social sciences. I made a similar (though much less beautiful) simulation for a workshop in in computational philosophy last semester - but replaced intentional with random movement when uphappy. http://dave.kinkead.com.au/models-of-segregation/ http://dave.kinkead.com.au/models-of-segregation/

phkahler 12y ago

Problem with this model. If you turn the bias way up (demand 80-90 percent of your neighbors be like you) the segregation drops to zero. That doesn't seem to make sense and I think it's because they're moving to random locations that have low probability of being "better" by the binary nature of the metric.

michaelochurch 12y ago
Right. If you make them super-racist, you get a chaotic state because the polygons move around constantly. I don't see it as a problem with the model. I think that it makes sense, because people who are extremely racist are (in addition to being morally in the wrong) impractical and chronically pissed off. However, you can get a very-segregated state by gradually turning up the racism (from 33% to 50%, then to 60%, then 70%). If you do it too fast (i.e. change the racist temperature too quickly) you get the chaotic state you're talking about. In the real world, this chaotic effect might be a negative (i.e. violent) interaction. Or, more hopefully, people might recognize such extreme bias as untenable and gradually find it undesirable to live in monoculture. By the way, I was able to get 99% (ETA: 100%) segregation (because engineering racist dystopias is the point of this exercise? :) ) by altering the racism level to move around the patches and "attack" small enclaves of blue in the yellow area. If you think of it as abstractly playing with optimization parameters with a hand-controllable Lagrange multiplier, it feels less evil.

raldi 12y ago

Are mobile devices supported? I can't make the page do anything.

michaelochurch 12y ago

There are many settings for which this process doesn't converge. I consider it a feature rather than a bug. For example, if you have the parameters at 33% and 100%, you converge on a racist/segregated state. However, at 33% and 95%, people keep moving around. You see the large contiguous regions that would otherwise be suburban enclaves hollow out. But you never get to a stable state, which is kinda like real life so it works. Small individual bias → Large collective bias. This is so incredibly true. I wrote about this. The blog post is specific to VCs, but I think the Racist Judges Problem is much more general. (http://michaelochurch.wordpress.com/2013/10/08/vc-istan-2-the-racist-judges-problem/ http://michaelochurch.wordpress.com/2013/10/08/vc-istan-2-th...) Let's say that we're having a cat beauty contest and, for the sake of argument and egregious simplification, that 35 states are completely non-racist and 15 states are extremely racist against orange cats. Let's also assume that beauty is uncorrelated to kitty-race and that there are only two colors: white (80%) and orange (20%). You'd expect that 7 contestants would be orange: a proportionate share from the non-racist states and none from the racist states. But you'll actually get very few, because the non-racist states still want their cats to win, so they'll be de facto racist for strategic reasons except for an occasional "weird" state (say, Minnesota) that nominates an orange cat and Fox News doesn't shut up about it being "political" in its "making a statement" (even if the orange cat from Minnesota was the most beautiful). Thus, when you look at the contestants and see 49-50 white cats, it creates a horrible and completely false perception that white is the standard of cat beauty and that no one finds orange cats beautiful. In other words, small differences in preference, once they gain a certain social currency and acceptability, snowball into something a lot more horrible. This is also why it's so important to keep racism socially unacceptable, and why Stetson Kennedy's infiltration of the Ku Klux Klan (he exposed it as childish and ludicrous) was so powerful.

a3_nm 12y ago

Great post, though I'm missing a definition of how do they mathematically define segregation. (Checking from the JS code, it seems to be an average over the shapes of the proportion of neighbor shapes which are like them.) Also, the title confused me a bit as I expected something related to Flatland. By the way, one of the two people behind this is Vi Hart, which has also made some brilliant videos featuring math, music, and brilliant silliness: https://www.youtube.com/watch?v=4niz8TfY794&list=UUOGeU-1Fig3rrDjhm9Zs_wg https://www.youtube.com/watch?v=4niz8TfY794&list=UUOGeU-1Fig...

vidarh 12y ago

This one is incredibly fascinating, even though it is simplified. One thing to keep in mind is that even if you exclude racial biases, you will maintain segregation if people have other - correlated - biases or limitations on their ability to move: In many countries, poverty is highly correlated with race, for example. This is certainly the case with the US, but also elsewhere. I live in London, and you see interesting effects of this. The inner city boroughs are quite segregated, both by race and wealth. Meanwhile, some of the outer boroughs are showing the reverse effect, where property price points appears to be a driver for mixing. E.g. Croydon, where I live, is one of the most mixed in London - it's at a price point that creates both young professionals of all races, and more established families of all races who are united in finding the inner boroughs either too expensive or too poor. But overall: Imagine that nobody had a racial preference, but had a wealth preference - and limitations. Now to overcome segregation, you face a near insurmountable barrier: Wealthier people would need to be willing to settle for housing and an environment of a much worse standard than they can afford, and poorer people would be unable to find housing that makes much difference. This is one of the biggest problems. The recent US situation with demonstrations over police killings, the race aspect has been blown out of proportion: You don't solve anything by focusing on the race issue, because so much of the violence is correlated more strongly with poverty than with race. You want to solve racial issues, start by addressing poverty. You'll still have race issues at the end of it, but it will turn out vastly smaller than what it appears, and you'll have removed a substantial source of excuses for racial biases.

Cthulhu_ 12y ago
Matter of fact, at least over here (NL), people aren't even allowed to live in low-rent housing if they earn more - there's even a movement that wants to raise low-rent house prices if the people living in them are earning more than they did when they moved in. Of course, that is also so that the cheaper houses become available for people moving into a house of their own for the first time (young families). But at the same time it causes the wealth-based segregation as you state, with all the associated side-effects.
mcv 12y ago
> _"Wealthier people would need to be willing to settle for housing and an environment of a much worse standard than they can afford, and poorer people would be unable to find housing that makes much difference."_ That is actually very easy to manage: don't make all houses in a neighbourhood the same. Make some to the standards of wealthy people, and others to the budget of poor people. The apartment building I live in has some houses that are rentals, and others that are purchased. Some are bigger, others smaller. As a result, we've got reasonable diversity (though still whiter than the rest of the neighbourhood). Of course addressing poverty is still a good idea, for this and many other reasons.

perfunctory 12y ago

Sometimes it feels like the open source web development environment I find myself in is all triangles.

pja 12y ago

This is a fantastic visual demonstration of a simple, but surprising (if you haven't seen it before) effect! Congrats to Vi Hart & Nicky Case (I presume Nicky did the web/javascript side of things?). This isn't just about race / skin colour either - you can see exactly the same effects in things like political viewpoints where people also tend to segregate into areas or simply social circles of people that share their own preferences. (pace the praphrased quote: "How could politician X win the election? Nobody I know would vote for them!")

moron4hire 12y ago

What does it say that anything over 75-85% "segregationism" leads to an almost completely desegregated community of shapes over time (though, they are constantly moving)?

amenghra 12y ago

"I'll move if less than 97% of my neighbors are like me" leads to less segregation because everyone is always moving...