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The Perpetual Diamond: Contrast Reversal Along Edges Create Appearance of Motion
- Zanni 7y agoThat's a really powerful effect. Is there a direct link to the demo somewhere? I only see embedded videos, even in the PDF.
- mxfh 7y agoArthur Shapiro, one of the authors, has a similiar interactive one here: http://shapirolab.net/P5/Diamond/ http://shapirolab.net/P5/Diamond/
- romwell 7y agoAwesome! It's really hard to not believe that the diamond is moving.
- lopmotr 7y agoIt might be fair to say that it is moving but also staying in the same position, as mentioned at the end of the article. To say it's not moving is like saying an animated sprite in a video game isn't moving either - sprite movement is just an "illusion" of continuous motion rather than the discrete appearance and disappearance of separate images that it really is. I wonder if when film or flipbooks were first invented, people considered them to be an optical illusion too?
- keyle 7y agoThat's the most striking visual trick I've ever seen. Surprised it's not used in advertising (yet).
- DiabloD3 7y agoDear God, I remember tricks like these being used in 8 bit era games.
- taneq 7y agoI wonder if there's any application for them in VR to counter motion sickness? Instead of a stationary object looking like it's moving, you have a moving field of view looking like it's stationary...
- mensetmanusman 7y agoIt’s not a bad thought: https://www.sciencealert.com/light-system-stops-motion-sickness-in-self-driving-cars https://www.sciencealert.com/light-system-stops-motion-sickn...
- gloflo 7y agoCould you point to some examples?
- adam-a 7y agoI would also be interested to see any examples of this in games, I can't think of any myself.
- JastrowsArc 7y agoI would like to see examples too! That would be cool
- soulofmischief 7y agoI've seen the reverse phi illusion effect crop up a few times in various places. [0] But as the paper says, it typically involved changing the luminance of the foreground object. It's cool to get a breakdown of exactly what makes this effect tick. Are there any other good non-static optical illusions such as this? As in illusions which require some element that changes over time cyclically in order to produce the effect? [0] https://michaelbach.de/ot/mot-reversePhi/index.html https://michaelbach.de/ot/mot-reversePhi/index.html
- zawerf 7y agoThere is a large collection of gifs based on the reverse phi illusion in a tiny obscure subreddit that I unfortunately can't find again. I think most of the submissions were made by a handful of users and they never referred to the effect by name. It was mostly artistic applications such as an angel infinitely rising upwards just by flashing two images. If someone finds it again, please let me know!
- soulofmischief 7y agoI too tried to find a few collections I've come across, but no luck... not too sure of what search terms to use. Was hoping someone else would come in clutch.
- panic 7y ago> Are there any other good non-static optical illusions such as this? As in illusions which require some element that changes over time cyclically in order to produce the effect? Here's one which uses the surrounding color to make synchronized flashes look like alternating flashes: http://illusionscience.com/contrast-asynchrony/ http://illusionscience.com/contrast-asynchrony/
- ehnto 7y agoThat is excellent. I developed a trick when playing piano where I can roughly count two things at once for a short period of time (Any Murakami fans? Hard Boiled Egg and the End of the World made me try it!). When I tried to do that to count the flashes the one I was looking at felt like it sped up to match the other one but I couldn't count both at once. My brain was well and truly tricked.
- aasasd 7y agoSo I guess this is the trick behind those trippy gifs. https://i.imgur.com/4oZyQFx.gif https://i.imgur.com/4oZyQFx.gif https://i.imgur.com/2eDISOQ.gif https://i.imgur.com/2eDISOQ.gif
- dredmorbius 7y agoEpileptics and others with strobe sensitivity: avoid.
- aasasd 7y agoIt's even worse with the second of these gifs: if I look at it frame by frame, with ample pauses, the scene still keeps rotating in the same direction. I know that two of the four frames must return to the other position, but I can't see it.
- JastrowsArc 7y agoYes! same thing only a minimalists version
- sridca 7y agoHN stinks so bad.
- twiceaday 7y agoI've recreated the illusion in 139 characters* of Javascript: https://www.dwitter.net/d/14459 https://www.dwitter.net/d/14459 * Dwitter has a built-in `R` for RGB color, `S` for Math.sin, and `x` for the 2d context of the canvas.
- r00fus 7y agoThis is amazing, Bravo. I found myself fascinated and just staring wondering when that diamond would get to the top. I wonder if this might be used for loading/waiting transition assets on apps/websites.
- hammerbrostime 7y agoDoes anyone else not perceive motion in this? I can see the background color oscillating, but the foreground figure remains stationary. Viewing it on an iPhone.
- tsukikage 7y agoPerhaps the iPhone is scaling the image down so much you lose the thin outline around the foreground figure? Try on a tablet or desktop.
- itronitron 7y agoi didn't really find it compelling until the point in the video when they change the direction
- JastrowsArc 7y agoCan you see the edges between the diamond and the background? Typically, the motion occurs when you can see the edges, and disappears when you are far enough away to make the edges too thin to be seen.
- r-bryan 7y agoWould it appear to be fixed in place if actually moving down the screen?
- vcdimension 7y agoLooks like the sort of thing you see at the early stages of a magic mushrooms or LSD trip.
- ot 7y agoIt's like a visual version of the Shepard tone https://en.wikipedia.org/wiki/Shepard_tone https://en.wikipedia.org/wiki/Shepard_tone