Knowledge

Facts, science and history of optical illusions.
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Pareidolia (Seeing faces)

Can animals see optical illusions? Hosico cat shows it with optical illusion rug

Animals and optical illusions

Billie Eilish drawn in 3D by Stephan Pabst

Anamorphic optical illusions

Crow

Original credit: jesusgains

If you do not have 20/20 vision, you will see a crow on the kitchen floor. But a closer look, or a pair of glasses, can help you identify the black cat.

More optical illusions:

Trail Runner Going into the Woods

$cat face refraction$

Cat’s face

Cats

Flying through the woods

Cats