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Knowledge Cats Dirty Minds
Depth Reversion Refraction Physics behind them

Knowledge

Facts, science and history of optical illusions.
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Superior mirages

Inferior and Superior Mirages, and Fata Morgana

Squirrel Stereogram

Stereograms

Is this a bird or a rabbit?

Ambiguous illusions

Trippy Stairs

Mirror Step by Derek Paul Boyle

Source/credit: Booooooom

This is an art installation by Derek Paul Boyle and features a mirror step on outdoor stairs.
(It may be art, but can potentially cause many problems; slipping, tripping and upskirt voyeurism.)

More optical illusions:

Water drop
Disappearing trailer
Cat Anus
Goblin spy on a plane
Paperthin Building
Ghost Cat
Larger than life
Eyeglasses
  • Pareidolia
  • Physical illusions
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Cat with a hole in its body

Cat with a Hole

Cats

Sexy Birch Tree

Sexy Birch

a dirty mind