A itinerant medicine vendor demonstrating a deceptive illusion to an audience, he is pretending to burn a man's back and then use ointment to clear up the burns, in order to sell his wares. Etching.

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Credit: A itinerant medicine vendor demonstrating a deceptive illusion to an audience, he is pretending to burn a man's back and then use ointment to clear up the burns, in order to sell his wares. Etching. Credit: Wellcome Collection. Attribution 4.0 International (CC BY 4.0)