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Knowledge Cats Dirty Minds
Clouds Color Constancy Mist

Knowledge

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

Squirrel Stereogram

Stereograms

sorrowful rock face pareidolia

How do optical illusions work?

Parallax effect

Parallax Effect

Laurel the Tree

An Ent named Laurel

Source/credit: Julien Delaval

This Stinking Laurel Tree lives in Fanal Forest, Madeira, a UNESCO World Heritage Site. The forest is known for its beautiful but eery atmosphere. The centuries-old laurel trees standing in the usual fog seem to have humanlike features.

More optical illusions:

World's Worst Carpet
Rainbow Road
Funny tree with a face
Bird Strike
Eye of God
Nature's Dance
Snake cat
Baby Bigfoot
  • Pareidolia
  • Physical illusions
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The eye of a cyber poppy

Cyber Poppy

Flowers

cactus rock climbing

Rock Climbing

Trees