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Optical Illusion #4 (Illusory Square)

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Greg
Wittmann
Explanation by Geek.com: "The phantom square connecting the four smaller dots is a result of illusory contours. The same effect happens with some static images, but it’s much more profound in this animation. It is believed illusory contours are generated in the V2 area of the visual cortex, which is responsible for processing complex shapes. It’s simply thrown off by the moving dots and the intersection of the larger dots with the square in the background. The result is that the smaller dots are perceived as the corners of a square."
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