The musical band/group Wintergatan (Swedish for “Milky Way”) is a creative group of musicians who utilize unexpected objects and mechanical devices to create their sound. They call their style of music — folktronica. This Marble Machine was created and built by Martin Molin, one of the band members (the others: Evelina Hägglund, Marcus Sjöberg, and David Zandén) and is powered by 2000 marbles.
Go to the Wintergatan website to see a series of videos about how the Marble Machine was designed and made.
Nexus 
Amazing isn’t it?