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Question Protected by Chris♦

occurred Sep 18, 2015 at 5:57

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occurred Jul 5, 2012 at 13:36

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edited Jul 5, 2012 at 13:03

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neuroscience eyes vision brain

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asked Jul 5, 2012 at 12:06

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How does this illusion work?

I found this image on Google+

enter image description here

If you shake your head you can see a portrait of a person. Can anyone explain how the image is constructed in the brain?

brain