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Knowledge

Facts, science and history of optical illusions.
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Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

Is this a bird or a rabbit?

Ambiguous illusions

Squirrel Stereogram

Stereograms

Sneaky steps

Sneaky steps

Source/credit: BettaSplendens1

This hotel room has some sneaky steps that are really hard to see, thanks to the zigzagging carpet.

More optical illusions:

If it fits...
Parrot
Bicycle wheels on a truck
Big bottoms
Flying cat
Giant bullfrog
Parking ramp
4 people
  • Pareidolia
  • Physical illusions
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deflated dog

Deflated dog

Dogs

giant christmas cat

Giant Christmas Cat

Cats