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From The Great Ball Contraption Wiki

Welcome to the Great Ball Contraption Wiki!, part of the Brickimedia network!

A great ball contraption (GBC) is a machine which receives LEGO® soccer balls or basketballs from one module and passes them to another module, rather like a bucket brigade. Modules built according to the GBC standard can be assembled into a collaborative display without modification. The GBC standard is minimal, permitting the builder great flexibility in designing the mechanism by which balls are moved from the input to the output. The otherwise pointless handling of balls, and the myriad ways this is accomplished, gives great ball contraptions the impression of a Rube Goldberg machine.

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A GBC Collaboration

a stair stepper module

See also[edit]


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