Knowledge

Facts, science and history of optical illusions.
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Animals and optical illusions

The history of optical illusions in art

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Ghost in a Tree

Source/credit: Liz Steward

Believe what you want, but this is a good example of pareidolia.
The gaps in the tree behind this odd couple look like a ghost. The eeriness of seeing a ghost in a tree is completed by the greenish hue of the old photo.

More optical illusions:

Dog jumping over Manhattan

Yard Ghost

Ghosts

Fried Chicken Tenders

Dogs