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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.

Squirrel Stereogram

Stereograms

Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

Prehistoric ambiguous illusion

The history of optical illusions in art

How many?

How many towers?
Photo by: Hines 

It is hard to tell how many towers this building in Hartford, Connecticut, has and where one ends and the other begins. The illusion is caused by the reflection in the windows.

More optical illusions:

4 people
Eye of a tree
Bald friends
Feeling deflated
Cup Half Full
Underwater Waterfall
Ominous bird
Grumpy tree
  • Pareidolia
  • Physical illusions
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