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Knowledge Cats Dirty Minds
Bicycles Advertizing Buildings

Knowledge

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

Superior mirages

Inferior and Superior Mirages, and Fata Morgana

Expanding Black Hole Illusion

Mind-blowing facts about optical illusions

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:

Eyeglasses
Dude, where is my car?
Tetanus Rainbow
Aerial View of a Beach
Magayon and Pangaronon
Giant Broccoli
Plane Crash
Big bottoms
  • 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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