Optical Illusions

The following optical illusions are from The Playful Eye.

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A boxing ring with two boxers, one standing, one prone.
Which boxer is tallest?
Roll your mouse over image for more.
Four clowns and two lines, which appear to be different lengths.
Which rod is longer?
Roll your mouse over image for more.
An angel standing on a cloud.
Stare at the angel's head for twenty seconds--then focus your eyes steadily on a plain white surface and the ghost will appear.
Are these three men clowns or bandits?
Cat and kittens. Can you see both?

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