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Facts, science and history of optical illusions.
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Forced perspective image Pisa tower

Forced Perspective

Squirrel Stereogram

Stereograms

Prehistoric ambiguous illusion

The history of optical illusions in art

Floor Color Creates Extra Dimension

The floor's color scheme makes this chair seem stuck in an extra dimension.

Source/credit: helloitsmesadness

The floor’s color scheme makes this chair seem stuck in an extra dimension.

If you look closer, you can see that the back of the chair is hanging off the pen holder of a white board.

More optical illusions:

Hand through a cat

Best for Stairs

Magayon and Pangaronon

Inappropriately Dressed

3D floor or LEGO brick floor

LEGO brick floor

Floors

Stairs inside a cabinet

Stairs Inside a Cabinet

Stairs