Knowledge

Facts, science and history of optical illusions.
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How to create optical illusion photos (for social media)

Inferior and Superior Mirages, and Fata Morgana

Stereograms

Catfusion

Source/credit: kawwmePoster

The catfusion in this optical illusion is where one cat starts and the other ends.

The cat on the left has its tail draped over the head of the one on the right, who is laying behind the left cat. The fur on the hind legs of the cat on the left now looks like it belongs to the collar of the white cat.

More optical illusions:

Screw hole

Landmarks

Afro tree

Trees