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Disappearing Dot Illusion
Put your face close to the screen and stare at the black cross in the center. Eventually, you will see a green dot. After that, all the purple dots will disappear.


"Disappearing Dot Illusion" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/DisappearingDotIllusion/
Contributed by: Ed Pegg Jr
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