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Facts, science and history of optical illusions.
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Mind-blowing facts about optical illusions

Inferior and Superior Mirages, and Fata Morgana

Stereograms

Floating tree

Source/credit: Anthonyonio

This floating tree in Springboro, Ohio, is actually curved, and leaning over the road. They’ve cut branches to allow cars through and to clear the power lines, instead of cutting it down altogether.

More optical illusions:

Big Dog

Dogs

River in the Sky

Clouds