Optical Illusion

The animated image below is an example of an optical illusion because it plays a trick on the eyes and brain. You will notice a green ball moving around in a circle around a number of pink balls. Look into the center of the animated image and concentrate on the cross +. What will happen is when you look at the cross + after a few seconds the green and pink balls will completely disappear. They are actually still there but your eyes and brain don't pick them up. It's the way the brain works, as far as sight goes, and is a cool optical illusion.

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