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Knowledge

Facts, science and history of optical illusions.
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Can animals see optical illusions? Hosico cat shows it with optical illusion rug

Animals and optical illusions

Squirrel Stereogram

Stereograms

Locomotives in their natural habitat

Pareidolia (Seeing faces)

North Sentinel Tribesman

Tribesman of North Sentinel Island

Source/credit: tmesisno

This banana peel hanging off a curb looks very much like a tribesman on the beach of North Sentinel Island. 

More optical illusions:

Eyeglasses
Dude, where is my car?
Big Bird
Cat defies gravity
A Festival for Ants
Smile!
Music Notes
Next to the boat
  • Pareidolia
  • Physical illusions
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Gmork

Cats

Hole in cat illusion

Hole in Cat

Cats