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Thanks Chris. I have seen variations on the top one, but not that exact one before.

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

by siegestate (siegestate or beyondwarispeace.com) on Sat Apr 24th, 2010 at 04:35:15 AM EST
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