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Knowledge

Facts, science and history of optical illusions.
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The Dress blue black white gold

Color Constancy Illusions

Squirrel Stereogram

Stereograms

Bezold effect fabric

Bezold Effect

Funny tree with a face

Funny tree with a face

Source/credit: \unknown Redditor via Jonathan Turley

This funny tree with a face was spotted by a Redditor in 2016. And even though the original post has been lost, it is still circulating online all these years later.

More optical illusions:

Hand through a cat
Big bottoms
Winter Tornado
Pixeled sky
Parrot
Sunken police car
Mysterious tree
Giant Cat
  • Pareidolia
  • Physical illusions
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a giant in the forest or real life ent

Giant in the Forest

Trees

Goofy tree with a face

Goofy Tree

Trees