Visual Illusions

This tic-tac-toe type picture does in fact have small white circles in each intersection. After staring at the circles and concentrating on them, you will notice that many of the circles around them look black. It's almost like when you're staring at a light bulb and then try to look at something else...you see abnormal spots in your vision. This illusion, although quite simple, is one of the more fascinating ones.

 

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Eye Phenomenon