Knowledge

Facts, science and history of optical illusions.
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The history of optical illusions in art

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

Shaven

Original Source: lost on the web

This really dirty illusion was created by two friends with shaven heads. How they discovered that two ears pressed against each other and a towel draped over their heads will look like labia, will remain a mystery, because the original source was lost on the web.