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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.

Parallax effect

Parallax Effect

Rorscharch inkblot

What Optical Illusions Reveal about You

Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

Shadow cat

Video credit:

The black cat does its best to hide as a shadow behind the other cat. But there is only so long that he can keep up.

More optical illusions:

Sword-billed Hummingbird
Blueberries
Inappropriately Dressed
Tetanus Rainbow
Flying Cargo Ship
Boiling a bird
Dock to the sky
Bride Waterfall
  • Pareidolia
  • Physical illusions
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This camouflaged kitty is hiding very well on the wooden floor. 

Camouflaged kitty

Cats

This photo is upside down. It is a nearly submerged SUV in a lake with many bystanders.  After this image was first posted to Reddit in January 2020, it has become a popular meme with the caption: "The difference between a UFO and a female driver is 180 degrees."

180 degrees

Cars