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Knowledge Cats Dirty Minds
Dogs Rocks Landmarks

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?

Superior mirages

Inferior and Superior Mirages, and Fata Morgana

Is this a bird or a rabbit?

Ambiguous illusions

Mammogram

Mammogram ad bald men illusion

Credit: Liga Contra el Cancer

This ad campaign for Liga Contra el Cancer used two bald men to promote the use of mammograms to detect cancer.

More optical illusions:

Floating Baby Boy
Sun Dogs
Stretchy Cat
Unsuspecting Amputee
Cat portal
A Festival for Ants
Deflated dog
Tree Mural
  • Pareidolia
  • Physical illusions
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Knees and toes sexy illusion ad campaign

Knees and toes

a dirty mind

Billboard illusion

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