So I got online and found these directions http://www.wikihow.com/Make-a-Rainbow on how to make a rain bow with a flashlight. He thought it was grand.
- 2Fill a glass with water. A fishbowl works well, but anything works well.
- 3Tape a flashlight on the hole in the piece of paper.
- 4Hold the paper up with the flashlight bar.
- 5Turn on the flashlight directly at the glass of water.
- 6Shazaam! A rainbow has appeared.