https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13981569
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.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use