Knowledge

Facts, science and history of optical illusions.
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The history of optical illusions in art

Inferior and Superior Mirages, and Fata Morgana

Forced Perspective

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:

Funny tree with a face

The Pensive Olive Tree

Big Dog

Dogs

River in the Sky

Clouds