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Knowledge Cats Dirty Minds
Geometry Mirrors Birds

Knowledge

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

Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

Can animals see optical illusions? Hosico cat shows it with optical illusion rug

Animals and optical illusions

Forced perspective image Pisa tower

Forced Perspective

Strained Expression

Credit: Isaac Cordal on Diminutos (via WaybackMachine)

This is a test for an urban installation projecting shadows with the city lighting, done by Isaac Cordal. The strained expression on the face was not an accident.

Here is another of his tests, posted on his WordPress site.

Isaac Cordal strainer art 

 

More optical illusions:

Lap Tiger
NASA doctored photos?
Cat portal
Headless Man
Disappearing trailer
Flying cat
Impossible Chairs
Best for Stairs
  • Pareidolia
  • Physical illusions
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These deadly stairs look wrong for a second, until you blink. If you can see it only in one way, just scroll up and down and you will see the other way appear.

Deadly stairs

Stairs

Penrhyn Castle in Wales looks like a swamp monster

Swamp monster

Buildings