J.R. Orci
Jon HenshawThis’ll break your brain. There are only two circles that do not cross over each other.
CaptMorgan@jon Thats the best optical illusion ive ever seen and I think it gave me a headache
NiceMicro@CaptMorgan @jon it anin't an optical illusion, it's instant headache.
Reg Braithwaite 🍓@jon If I defocus and don't let my eyes roam around the diagram "remembering" what they've just seen and filling that in for my peripheral vision, I can see the two circles.
Also, if I physically point to either circle and follow it with my finger, I can see that they don't overlap.
trés fun! thank you!
Doug Whitfield [Minneapolis]@jon maybe I'm a weirdo but looks like a circle in a circle to me
Everyone’s brains are different 😀
@jon the one thing I guess that is a little weird is they don't truly look like circles they look ever so slightly egg shaped...frankly, a bit like a guitar pick but not quite that pointy.
Mark Whybird
Sordid Amok!@jon This gif is moving too fast.
It’s a still image. Your brain is the gif.
日本語まあまあ
amber@peachlemonaid @jon Another one! That makes another commenter here and one person IRL I know who don’t see the illusion. I would love to know what % of people you all are!
June BlueSpruce@whybird @peachlemonaid @jon My brain was pulled into the illusion, but I could see the two circles very quickly.
billy joe bowers-8647That is really hard to look at.
JonChevreau@jon quite the Illusion!
thefathippy
Endless Screaming@thefathippy AAAAAAAAAAHH
David 🏳️🌈🏳️⚧️NB he/they@jon A good example of how what we think of as reality is just our brains hallucinating the world in front of us.
Brian DearIf you tweak the image to extreme limits you can more easily tell it’s just two “circles,” or, more accurately, akin to two concentric, circular, careful arrangements of “snake-skin” scales with special repeating patterns.
The brain’s totally not ready to handle the unaltered image but does better with my version.
Preston Maness ☭
Roman ALANCover half the image (top/bottom, or left/right) and it'll resolve …
GrnLakeRunnr
Shadow Morningstar
Rochelle
Cleethorpes Info Bot 
@jon Looks like the mains lead on my iron. That's definitely crossed over.
Jean-Fulgence@jon Funny one! I could see there are only two circles, but I read the toot before I saw the image, so I guess I'm biased.
Metamere@jon
This is one from a really cool set of illusions created by Dr. Akiyoshi Kitaoka. The illusion is actually that they are concentric circles that appear to be distorted and non-concentric. You can get a better feel for it by playing around with my interactive version here:
https://preview.openprocessing.org/sketch/1941150/preview/false/index.html?random=0.07879569708521861&illusion=11
(it runs much better in Chrome than in Firefox, and it works on mobile)