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Knowledge

Facts, science and history of optical illusions.
See all the articles or scroll down to see what you came for.

Squirrel Stereogram

Stereograms

Prehistoric ambiguous illusion

The history of optical illusions in art

Forced perspective image Pisa tower

Forced Perspective

Wolf pack

wolf pack
Original credit: lost on the internet

At first glance, it looks like a book about a happy wolf pack with the wolf on the left probing the  one on the right, but when you switch your focus, you can see it is not a paw but a tail.

More optical illusions:

Cross-stitch Cats
Erased Street Art
Back to School
Cat's face
Elvish Writing
Dude, where is my car?
Skull
Floating either way
  • Pareidolia
  • Physical illusions
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too many legs to climb this ladder

Too many legs

People

Kamasutree

a dirty mind