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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

Bezold effect fabric

Bezold Effect

Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

Papercut

Papercut

Source/credit: BroboxylicAcid

This papercut makes the thumb look like a penis. 

More optical illusions:

Floating tracks
Giant Broccoli
Hidden cat
A Starry Night Sky
Swamp monster
Afro tree
Nobody's cow
Monkey Selfie
  • Pareidolia
  • Physical illusions
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Grid illusion busty shirt

Grid Illusion Shirt

Objects

Beach Yeti

Beach Yeti

Dogs