How to view a solar eclipse

3. You can use only two pieces of cardboard--one piece colored white to project on to, and the other with a pinhole. Hold up the pinhole as far from the screen as you can. Remember, the farther you are from the screen, the bigger your image.

Get two pieces of cardboard--one piece colored white to project onto. Cut a square in one cardboard, then tape  a piece of foil over the square. Now make a pinhole  in the middle of the foil. With the sun behind you, hold  the pinhole cardboard as far from the white cardboard as  you can. Remember, the farther you are from the screen,  the bigger your image.