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The proof for the lower one, Adelson's checker illusion, is at this site: Checkershadow Illusion

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.

by gk (gk (gk quattro due due sette @gmail.com)) on Sun Apr 25th, 2010 at 09:24:39 AM EST
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