To make a awesome wave machine, you only need 3 things: gummy bears (candy), duct tape, and skewers. It took me about 15 minutes to make.
When lifting the gummy bear up and releasing it causes a disturbance that sends energy from one end to the other end and back. Depending high you raise the gummy bear is how big the disturbance will be, but not matter how high you raise the gummy bear it will always go the same speed back and forward. If you want to change the speed take off half of the gummy bears and it will go one speed the first half with the gummy bears and faster without the gummy bears.