In the 1640’s, a German priest living in Rome developed the magic lantern, which cast shadows from glass slides onto a screen, a precursor to modern cinema. This shadow lantern works on the same principle. A light source inside casts the shadow from a stencil onto a paper screen. It’s reversible, and you can display it as a lantern or a folding screen.
If you like this class, you might also be interested in the 6-week Paper Lanterns online course.