https://www.fi.edu/science-recipes/thaumatropes Your next project is going to be a little different--both in execution and submission. You are going to design and then construct a Thaumatrope. A Thaumatrope is an optical toy that relies on the principle of Persistence of Vision. Persistence of Vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. Persistence of Vision is why movies and animation appear to move even though what you are actually seeing is a series of still images. This link takes you to a great historical examination of Thaumatropes: https://graphicarts.princeton.edu/2013/10/28/thaumatrope/ For an interesting example of Persistence of Vision, watch the video linked to below: https://www.exploratorium.edu/snacks/magic-wand Place a prepoderence of your energy on devising a creative solution...that means no birds-in-cages, fish-in-fishbowls, or anyt...