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Knowledge Cats Dirty Minds
Physics behind them Forced Perspective Hidden objects

Knowledge

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

Rorscharch inkblot

What Optical Illusions Reveal about You

sorrowful rock face pareidolia

How do optical illusions work?

Parallax effect

Parallax Effect

Cat a log

Find the cat
Source/credit: waterhauler

The cat looks like a piece of firewood.
Middle stack, second piece of firewood from the top is not made of wood, but a light-orange tabby cat.

More optical illusions:

Flying Dutchman
Bird Strike
Transparent coffee cup
World's Worst Carpet
Unsuspecting Amputee
Plane Crash
Calm Lake
Geometric Shapes
  • Pareidolia
  • Physical illusions
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Street in Macau

The Invasion

Buildings

Elvish writing

Elvish Writing

Objects