Here are some more good ones:
https://www.sciencealert.com/this-3d-optical-illusion-will-m...
... which embeds my all-time favorite ("Ambiguous Cylinder")
Perceptual Illusions
11–20 of 26 posts
Re: Perceptual Illusions
#12These are cool. FYI some of the images are displayed at the wrong aspect ratio. The final example in particular is pretty squished, I recommend opening the image in its own tab.
Re: Perceptual Illusions
#13Still can’t subscribe to the print edition!
Re: Perceptual Illusions
#14This is a timely post, considering the 2018 Best Illusion of the Year Contest has just posted http://illusionoftheyear.com/cat/top-10-finalists/2018/ .
Re: Perceptual Illusions
#15I was recently investigating a CSS shadow issue that looked like an uneven shadow across the bottom of an element that had a lighter section and a darker section, but it turned out to be illusion #6! I had to do the color picker method on the shadow to convince myself, and even after I had convinced myself by drawing a single color line in between, my eyes were still fooled. Very tricky!
Re: Perceptual Illusions
#16I used to have a printout of https://www.michaelbach.de/ot/mot-snakes/index.html over my desk. People got so freaked out by a piece of paper "moving" that there were people who literally refused to go to my desk. :-)
Re: Perceptual Illusions
#17These are great and many were new to me. Instead of #6, the one involving moving the square from the light to dark side, I prefer the static Checker Shadow illusion[1], using the same priciple. The problem with involving electronics in it is that there always is suspicion that the machine is playing the trick instead of just your visual system. [1] https://en.m.wikipedia.org/wiki/Checker_shadow_illusion
There are no electronics in #6. That's just a piece of paper sliding back and forth over another piece of paper.
Re: Perceptual Illusions
#18whoa, turns out some people with autism, schizophrenia and transgenderism aren't affected as much by these illusions if at all.
Re: Perceptual Illusions
#19I’m always annoyed by the arrow length trick. This article calls it the “Müller-Lyer” illusion. The problem is inconsistent line caps and the joints overlapping means that the size of the line actually is changing a little. As a result, I’m not sure whether there’s an optical illusion involved or not, and, if there is, this is a poor way of demonstrating it.
Re: Perceptual Illusions
#20Seems like the human perceptual system is easily hacked. I wonder how close we can get to an actual Snow Crash bitmap?