Craik-O'Brien-Cornsweet Illusion


Move mouse pointer over figure to see that the upper and lower blocks are the same shade of gray.

Purves' Shade-Block Illusion

This figure is from Purves Lab
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See http://www.perceptionweb.com/perc1197/wachtler.html and
Why We See What We Do for more information.
Also and Adelson's Checker-Shadow for a similar illusion.

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Last revised: April 7, 2003