Things You'll Need
Instructions
Purchase a pair of 3-D glasses from a party store. Gently remove the red and blue filters from the glasses.
Place a filter from the glasses over the end of the flashlight that emits light. The flashlight should be a round flashlight no bigger than four inches in diameter. It should be small enough to fit in your hand so that you can use it easily.
Purchase a plastic tube at least two feet long. You can also make one yourself if you have plastic sheets lying around the house. Staple the ends together to form a cylinder.
Insert the flashlight into one end of the plastic tube. If the flashlight is loose, tape it to secure it. If the tube is too tight cut off material at one end with sharp scissors so that it fits snugly around the flashlight.
Cut out a piece of aluminum foil. Tape the aluminum foil to the uncovered end of the plastic cone. Secure with a rubber band to make sure the foil won't fall off.