Giant Instrument Utilizes 2,000 Marbles to Play Music
Martin Molin spent 14 months building a huge, intricate wooden machine that uses 2,000 marbles to play music.
A conveyor belt grabs them at the bottom, and brings them to the top. Then it drops them on different things, likes xylophone keys, bass guitar strings, and drums. The musician has to keep turning a crank on the side to make it work.