Find the dog in the field in 11 seconds.

They can make us believe things don't exist or see things that don't.

Ancient people called these optical illusions witchcraft, devils, or evil spirits.

Later, scientists realized that varied perceptions cause our brains to trick us. 

Triangles, circles, squares, rectangles, etc. are used to produce optical illusions. 

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Various arrangements of these shapes generate the effect. 

To see what's hidden or not there.

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