Knowledge

Facts, science and history of optical illusions.
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The history of optical illusions in art

Billie Eilish drawn in 3D by Stephan Pabst

Goblin spy on a plane

This goblin staring into your soul is just a scary optical illusion

Source/credit: HeavyLoungin

“that motherfucker back there ain’t real”
This monster on an airplane terrifies anyone, just staring into your soul.
However, this is just an optical illusion. The “eye is a very shiny black earbud and the nose is some hair at the back of the neck of this passenger.