Knowledge

Facts, science and history of optical illusions.
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Forced Perspective

How to create optical illusion photos (for social media)

Bezold Effect

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.

More optical illusions:

Funny tree with a face

Thats the cat's pajamas

Deadly stairs

Stairs

Swamp monster

Buildings