A Gee Haw is a traditional wooden problem solving toy. Somehow, magically, when you say "gee," the propeller will move in one direction and when you say "ha" it will move in the opposite direction. See you if you can figure it out! :D
These toys are generally made of wood. Vibrations from the sticks rubbing together (along with saying the magic words) move the propeller in different directions.
This functioning prototype is made of illustration board, a push pin and adhesive.