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Knowledge Cats Dirty Minds
Buildings Mirrors Snakes

Knowledge

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

Expanding Black Hole Illusion

Mind-blowing facts about optical illusions

Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

Rainbows are illusions

Types of Optical Illusions

If it fits…

cat in box optical illusion

Source/credit: 花憐

This physical optical illusion is caused by a reflection. The cat is sitting on the left side of the glass door, while the box is placed on the right side of the door.
The reflection perfectly places the cat in the box.

More optical illusions:

Missing pixels
Schrödinger's Scat
Howling Wolf
Not a brick
Feeling deflated
A sorrowful rock
Apartment on fire
Rainbow Road
  • Pareidolia
  • Physical illusions
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How many pipes in this geometrical illusion?

How many pipes?

Objects

cat defies gravity

Cat defies gravity

Cats