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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.

The Dress blue black white gold

Color Constancy Illusions

sorrowful rock face pareidolia

How do optical illusions work?

Expanding Black Hole Illusion

Mind-blowing facts about 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:

Big dog
Bald friends
River in the Sky
Dog Log
Rock Climbing
Floating cat head
Taj Mahal
How many?
  • 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