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Knowledge Cats Dirty Minds
Stairs Trees Ghosts

Knowledge

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

Forced perspective image Pisa tower

Forced Perspective

Rorscharch inkblot

What Optical Illusions Reveal about You

Bezold effect fabric

Bezold Effect

Three Rings Forced Perspective Illusion

Video credit: Dr Matt Pritchard

Apparent size is relative. It is connected to the distance of the object.

This fact can help in creating Forced Perspective videos like this one with three rings of different sizes.

More optical illusions:

River in the Sky
Lap Tiger
Grate View of Central Park
Assorted Dried Beans
Exotic Bird
Dog Head Mount
Giant Moon
Fair Game
  • Pareidolia
  • Physical illusions
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AI

The shadow of this cameraman on the shirt of the man on the right creates a dirty optical illusion

Foreshadowing

a dirty mind