The Lego Great Ball Contraption (GBC) Layout 2012.9 is an incredibly famous MOC. The whole thing is built using a modular system. A total of 17 modules combine to create this massive contraption. It runs 500 Lego balls, at a rate of 1 ball per second, through a 31 meter course. Featuring zigzag stairs, pneumatics, shooters, trains, screw and spiral lifts, elevators and conveyor belts. Lego bricks, technic and Mindstorm, all come together in a very unique machine. One thing is certain this Lego machine is loud.
The Lego Great Ball Contraption (GBC) 2012.9 is a creation of YouTube user Akiyuky, more contraptions can be found on his blog: http://legokarakuri.blog91.fc2.com