Vision is more complicated than just light entering your eye. Your brain works hard to make sense of the information entering it. When it sees sequential images that seem to be similar, it assumes a relationship. A zoetrope takes advantage of that, presenting separate, slightly changed images interrupted by darkness. The brain interprets those images as motion.
Zoetropes were invented in the early 1800s. The principles underlying zoetropes are much the same as modern film. Movies show still images at a very fast rate, and your brain interprets them as continual action.
Mess Kits are single-serving experiments that allow kids to explore scientific concepts at their own pace. Visitors are encouraged to complete as many as they want! See all Mess Kits.