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Knowledge Cats Dirty Minds
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Knowledge

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

Squirrel Stereogram

Stereograms

Parallax effect

Parallax Effect

Rorscharch inkblot

What Optical Illusions Reveal about You

Gateway Arch

The Gateway Arch in St Louis is an optical illusion. The arch is as tall as it is wide; 192 meters. But from nearly every angle it will seem much taller than it is wide.

Source/credit: JakeHuberMedia

The Gateway Arch in St Louis is an optical illusion. The arch is as tall as it is wide; 192 meters. But from nearly every angle it will seem much taller than it is wide. And you can’t really see the arch head-on when standing on the ground.

 

More optical illusions:

Misaligned Arrow
A Flying Island
Off-road Truck Capabilities
Two giants
Schrödinger's Scat
Bride Waterfall
Impossible Chairs
Eye of God
  • Pareidolia
  • Physical illusions
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A woman bent over a desk with her big butt in view

Bent over the desk

a dirty mind

Finally a more creative forced perspective photo at the Leaning Tower of Pisa. The photographer, Suíssas, is a very creative artist making optical illusion photos that are next level, like this Checkmate.

Checkmate

Landmarks