You show the spectators a cardboard frame with a large window in it. Through the window a black and white line drawing of a well dressed person. As you slowly slide the picture out of the frame, it visibly becomes a full color picture… like ...
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The magician hands out a wire coil to a spectator and asks them if they can remove the metal ring from the coil. Try though they might, removing the ring from the coil is impossible.
The magician, however, can remove ...