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Freaky optical illusion

posted by Jason Kottke   Dec 06, 2013

Which gray block is actually darker? Hold something over the seam to find out.

Optical Illusion Blocks

Mindblowing, right? Now for the fun science part: how does this effect work? Well, it works because whoever made this thing is a fucking witch. I mean, Jesus. QED. (via ★interesting-links)