6 ms·

Akiyoshi's Illusion Pages

180 points by mxfh 6y ago

nr2x 6y ago
I can’t believe he’s still updating this, thanks so much for the link. Been years since I saw this. The guy is straight-up hacking your visual processing system!
nneonneo 6y ago
I would also recommend following Akiyoshi on Twitter (https://twitter.com/AkiyoshiKitaoka https://twitter.com/AkiyoshiKitaoka) so you can have a daily dose of visual hackery on your Twitter feed :)
- yboris 6y ago
  It's got amazing stuff! https://twitter.com/AkiyoshiKitaoka/status/1350001714443608065 https://twitter.com/AkiyoshiKitaoka/status/13500017144436080...
systemvoltage 6y ago
Love the classic professorial web design.
- miahi 6y ago
  I remember stumbling on this page in 2003-2004. When I saw the title here I thought 'I hope it's the same' - and it is! It looks exactly like it was back then[1]. Love it! [1] https://web.archive.org/web/20030202031646/http://www.ritsumei.ac.jp/~akitaoka/index-e.html https://web.archive.org/web/20030202031646/http://www.ritsum...
ku-man 6y ago
I am sure I am not the only one but some of the illusions do not work for me, and some only work after reading the description. Does your brain needs to be trained to 'get' the illusion?
- flyinghamster 6y ago
  I've noticed that as well - but others just about leap off the page for me. Also, some only seem to work at certain distances, or if I am moving, or if I'm scrolling the page.
- toyg 6y ago
  Vision is deeply entangled with pattern recognition, so it makes sense: feeding data into your brain about what it's expected to detect will help with detecting it. It's counterintuitive, but in the end vision is not really the low-level signal we think it is, but rather a pretty high-level conceptualization.
skc 6y ago
What's curious for me is that I've visited these illusions before in the past and over time I've noticed that I've gradually stopped experiencing a growing number of them.
shmerl 6y ago
Related: https://en.wikipedia.org/wiki/Peripheral_drift_illusion https://en.wikipedia.org/wiki/Peripheral_drift_illusion
kristopolous 6y ago
I like the hit counter with 129 million at the bottom
kirchhoff 6y ago
Another site in a similar vein, which is worth a mention. https://michaelbach.de/ot/ https://michaelbach.de/ot/
TonyTrapp 6y ago
Seen many of those countless times on the internet without credits. Great to see the original source, thanks for sharing!
Aardwolf 6y ago
http://www.psy.ritsumei.ac.jp/~akitaoka/saishin63e.html http://www.psy.ritsumei.ac.jp/~akitaoka/saishin63e.html "Illusory yellow is observed around hearts." Had to zoom to be convinced that there really are indeed no #ffff00 pixels in there This would be an interesting way to create the illusion of fifth color in 4-color CGA
yutopia 6y ago
This is super interesting: http://en.ritsumei.ac.jp/news/detail/?id=278 http://en.ritsumei.ac.jp/news/detail/?id=278 https://www.frontiersin.org/articles/10.3389/fpsyg.2018.00345/full https://www.frontiersin.org/articles/10.3389/fpsyg.2018.0034... Apparently he showed his "rotating snake" image to a neural network trained to predict upcoming video frames, it also "saw" the illusory motions.
xenocratus 6y ago
I find it funny and cute seeing animals react to these: https://www.youtube.com/watch?v=CcXXQ6GCUb8&ab_channel=rasmusab https://www.youtube.com/watch?v=CcXXQ6GCUb8&ab_channel=rasmu... https://www.youtube.com/watch?v=S4IHB3qK1KU&ab_channel=SquirrelMaster https://www.youtube.com/watch?v=S4IHB3qK1KU&ab_channel=Squir...
jonhohle 6y ago
When seeing lists of optical illusions, I never see anything regarding Edward Land's work regarding the perception of color in red/white images[0]. With readily available HDR displays this may no longer be relevant, but still interesting. 0 - https://web.archive.org/web/20080914012938/http://land.t-a-y-l-o-r.com/ https://web.archive.org/web/20080914012938/http://land.t-a-y...

180 points by mxfh 6y ago

nr2x 6y ago

I can’t believe he’s still updating this, thanks so much for the link. Been years since I saw this. The guy is straight-up hacking your visual processing system!

nneonneo 6y ago

I would also recommend following Akiyoshi on Twitter (https://twitter.com/AkiyoshiKitaoka https://twitter.com/AkiyoshiKitaoka) so you can have a daily dose of visual hackery on your Twitter feed :)

yboris 6y ago
It's got amazing stuff! https://twitter.com/AkiyoshiKitaoka/status/1350001714443608065 https://twitter.com/AkiyoshiKitaoka/status/13500017144436080...

systemvoltage 6y ago

Love the classic professorial web design.

miahi 6y ago
I remember stumbling on this page in 2003-2004. When I saw the title here I thought 'I hope it's the same' - and it is! It looks exactly like it was back then[1]. Love it! [1] https://web.archive.org/web/20030202031646/http://www.ritsumei.ac.jp/~akitaoka/index-e.html https://web.archive.org/web/20030202031646/http://www.ritsum...

ku-man 6y ago

I am sure I am not the only one but some of the illusions do not work for me, and some only work after reading the description. Does your brain needs to be trained to 'get' the illusion?

flyinghamster 6y ago
I've noticed that as well - but others just about leap off the page for me. Also, some only seem to work at certain distances, or if I am moving, or if I'm scrolling the page.
toyg 6y ago
Vision is deeply entangled with pattern recognition, so it makes sense: feeding data into your brain about what it's expected to detect will help with detecting it. It's counterintuitive, but in the end vision is not really the low-level signal we think it is, but rather a pretty high-level conceptualization.

skc 6y ago

What's curious for me is that I've visited these illusions before in the past and over time I've noticed that I've gradually stopped experiencing a growing number of them.

shmerl 6y ago

Related: https://en.wikipedia.org/wiki/Peripheral_drift_illusion https://en.wikipedia.org/wiki/Peripheral_drift_illusion

kristopolous 6y ago

I like the hit counter with 129 million at the bottom

kirchhoff 6y ago

Another site in a similar vein, which is worth a mention. https://michaelbach.de/ot/ https://michaelbach.de/ot/

TonyTrapp 6y ago

Seen many of those countless times on the internet without credits. Great to see the original source, thanks for sharing!

Aardwolf 6y ago

http://www.psy.ritsumei.ac.jp/~akitaoka/saishin63e.html http://www.psy.ritsumei.ac.jp/~akitaoka/saishin63e.html "Illusory yellow is observed around hearts." Had to zoom to be convinced that there really are indeed no #ffff00 pixels in there This would be an interesting way to create the illusion of fifth color in 4-color CGA

yutopia 6y ago

This is super interesting: http://en.ritsumei.ac.jp/news/detail/?id=278 http://en.ritsumei.ac.jp/news/detail/?id=278 https://www.frontiersin.org/articles/10.3389/fpsyg.2018.00345/full https://www.frontiersin.org/articles/10.3389/fpsyg.2018.0034... Apparently he showed his "rotating snake" image to a neural network trained to predict upcoming video frames, it also "saw" the illusory motions.

xenocratus 6y ago

I find it funny and cute seeing animals react to these: https://www.youtube.com/watch?v=CcXXQ6GCUb8&ab_channel=rasmusab https://www.youtube.com/watch?v=CcXXQ6GCUb8&ab_channel=rasmu... https://www.youtube.com/watch?v=S4IHB3qK1KU&ab_channel=SquirrelMaster https://www.youtube.com/watch?v=S4IHB3qK1KU&ab_channel=Squir...

jonhohle 6y ago

When seeing lists of optical illusions, I never see anything regarding Edward Land's work regarding the perception of color in red/white images[0]. With readily available HDR displays this may no longer be relevant, but still interesting. 0 - https://web.archive.org/web/20080914012938/http://land.t-a-y-l-o-r.com/ https://web.archive.org/web/20080914012938/http://land.t-a-y...