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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.

Parallax effect

Parallax Effect

Is this a bird or a rabbit?

Ambiguous illusions

Forced perspective image Pisa tower

Forced Perspective

Gavin’s “girl” friend

Gavin's girl friend
Source/credit: Gavin of Sneaky Cycles

The bike seat is skin colored and sticking out between the legs of a girl wearing short shorts.

More optical illusions:

Pump it up!
Transparent coffee cup
Freak of Nature
Missing Chair Leg
Catfusion
How many?
Thats the cat's pajamas
Big women
  • Pareidolia
  • Physical illusions
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Find the cat

Cat a log

Cats

Elvish writing

Elvish Writing

Objects