Swedish musician Martin Molin built the Wintergartan Marble Machine, a wonderful Rube Goldberg contraption to play out a rather uplifting ditty. It’s an intricate music box made up of specially crafted pulleys, funnels, and tracks that guide some 2000 metal marbles through the machine to play the different musical instruments. Molin started building the machine in 2014.

[via @dev_za]