Here's one idea from NASA: A box pinhole projector. NASA put together the video in the player above that shows you step-by-step how to make one.

To make one, you'll need a cardboard tube, white paper, aluminum foil, tape and a pushpin or something else sharp to poke a small hole. According to "Let's Talk Science," you can put this viewer ...

How to make your own eclipse pinhole projector Get a cardboard box, a white sheet of paper, tape, scissors, and piece of aluminum foil.