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Facts, science and history of optical illusions.
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Prehistoric ambiguous illusion

The history of optical illusions in art

Bezold effect fabric

Bezold Effect

Is this a bird or a rabbit?

Ambiguous illusions

Goofy Tree

Goofy tree with a face

Source/credit: kcems

This goofy tree seems very content.

This is a nice case of pareidolia, where we see faces in random patterns such as tree bark, clouds or stars.

More optical illusions:

Misbehaving Shadow

NASA doctored photos?

Funny tree with a face

Funny tree with a face

Trees

The eye of a cyber poppy

Cyber Poppy

Flowers