A zoetrope is a mechanical device that creates the illusion of moving pictures, based on a spinning cylinder in which slits are cut. You look through the slits at a picture on the other side, and the strobe effect of looking through the sequence of slits frames the sequential pictures on the inside. It was invented in about 180AD. That’s a long time ago! The modern way to do it is to use strobe lights or camera shutters to recreate the effect of looking through slits, but however you do it, a zoetrope is still magical. See a variety of them in action in this video collection I posted at mental_floss.
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