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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

Expanding Black Hole Illusion

Mind-blowing facts about optical illusions

Is this a bird or a rabbit?

Ambiguous 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:

Realistic Painting
White Egret
Grid Illusion Shirt
Bushfire
Schrödinger's Scat
Dogs sharing a mouth
Laurel the Tree
Artificial Leather
  • 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