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The proof for the lower one, Adelson's checker illusion, is at this site: Checkershadow Illusion
Here is a number of illusions called: Lightness Demonstrations.
For a site of color-centric illusions: Illusion and color perception-Akiyoshi Kitaoka
This stuff is so fun, that I could spend a morning on it.
Motion, Form, and Mid-Level Vision: A Tutorial
There is also the illusion of using space when one presumes a flat object: First Second
If you see a proof of your top submission, please pass it on. Never underestimate their intelligence, always underestimate their knowledge.
Frank Delaney ~ Ireland
For some reason or other, I don't get the "proof". It convinces me that either the original image or the proof is an optical illusion, but I can't decide which. Using an image editor and moving a small piece from one square of the image to the other is what worked for me.
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