Note: Do not rely on this information. It is very old.
ZoetropeZoetrope is an instrument or toy whose action depends upon the persistence of vision. A number of pictures, representing the different positions successively assumed by a moving object are rapidly presented to the eye. But the eye has not ceased to see one picture (although the picture has passed away) before the next is presented to it, and so, instead of viewing it as a new picture, it merely seems as though the object in the first has changed its position to that shown in the next. As the rest of the series comes into view, it seems to the eye as though the object were actually moving into the various positions indicated on the picture.