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Blinking Buttons Optical Illusion


When you stare at this optical illusion, do black dots appear and vanish at the intersections? How can this be?
Optical Illusions - Blinking Buttons

Optical Illusions - Blinking Buttons

Public domain image.
How it works: This image is an example of the scintillating grid illusion, a variation of the Hermann grid illusion.

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