How do you make a pinhole box viewer?

To make a pinhole box viewer, start with a cardboard box and cut a small hole (about 1-2 mm) in one side for the pinhole. Cover the hole with a thin piece of aluminum foil, securing it with tape, and poke a tiny hole in the center to create the pinhole. On the opposite side of the box, attach a piece of white paper to serve as a screen. Finally, point the pinhole towards a light source, and you will see an inverted image projected on the screen inside the box.