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
Back to Illusions

For more information, see Why We See What We Do,,, and
Also see Adelson's Checker-Shadow for a similar illusion.

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Revised: October 26, 2005