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Knowledge Cats Dirty Minds
Impossible objects Mirage Depth Reversion

Knowledge

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

Is this a bird or a rabbit?

Ambiguous illusions

Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

Prehistoric ambiguous illusion

The history of optical illusions in art

Christmas candle

Grandma's placemats with a christmas candle show a dirty optical illusion

Source/credit: BigPappa21

There is probably no explanation needed for this case of pareidolia. The Christmas candle and balls on these placemats speak for themselves.

More optical illusions:

Cat Anus
Bending the Walls
Reflected rice fields
Echidna kitten
Phoenix rising
Baby Bigfoot
Grate View of Central Park
A Little Army
  • Pareidolia
  • Physical illusions
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The shadow of this cameraman on the shirt of the man on the right creates a dirty optical illusion

Foreshadowing

a dirty mind

The monument to Karla Havlíček Borovský, a famous Czech journalist, poet and writer, was naturally enhanced by wasps in 2022.

Naturally enhanced

a dirty mind