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

Armpit

Oldest Source: IziSmile

The original source of this classic dirty optical illusion has been lost on the web already.
However, it remains a funny picture of a woman’s armpit looking like something more personal. The overexposure and similar skin tones of the women, cause the women to look like a single body.