Amazing Wooden Marble Machines

Since 2009, Paul Grundbacher of Switzerland has spent his winter free time building seven amazing marble machines. Crafted almost entirely from wood, each machine moves marbles about in a different and inventive way—“Qatro” shoots and catches marbles, “Stockwerke” advances them up a series of moving floors, “Chaos” does a bit a everything. Most of his machines are based on devices and plans he found on the Internet, but his most recent machine, “Archimedis,” is entirely original and by far the most elaborate.