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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

The Dress blue black white gold

Color Constancy Illusions

Her Only Fan

This man with glasses in front of a woman is her only fan. The image is a very dirty optical illusion. Or is it your mind?

Credit: deleted post on r/WTF

This man with glasses in front of a woman is her only fan. The image is a very dirty optical illusion. Or is it your mind?

The oldest source seems to be Reddit/WTF. However, the original image has since been deleted on the internet. 

More optical illusions:

Escher drawing IRL
Headless figure
Sun Dogs
Plane Crash
Impossible woodwork
Scale Model of a Courtyard
Hand through a cat
Hidden ad in advertisement page
  • Pareidolia
  • Physical illusions
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This is a big daddy dog looking proud

Big Daddy

Dogs

These deadly stairs look wrong for a second, until you blink. If you can see it only in one way, just scroll up and down and you will see the other way appear.

Deadly stairs

Stairs