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Knowledge Cats Dirty Minds
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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.

sorrowful rock face pareidolia

How do optical illusions work?

Rainbows are illusions

Types of Optical Illusions

Prehistoric ambiguous illusion

The history of optical illusions in art

Geometric Shapes

The Pyramid of Khafre

Source/credit: Giza 3D Survey

These geometric shapes are actually the Pyramid of Khafre at Giza seen from directly overhead.

More optical illusions:

Cat's face
Raw Chicken
Freak of Nature
Bar Stools
Confusing pants
Floating helmet and wheel
Amish Men using a Truck
Skull
  • Pareidolia
  • Physical illusions
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A slate patio

This Patio

Floors

Sloped floor

Mind-boggling Floor

Floors