The Great Ball Contraption Wiki

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A GBC Collaboration

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

What is a Great Ball Contraption?

A great ball contraption (GBC) is a machine which receives 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 pre-planning or 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.

a stair stepper module

Upcoming GBC Events

North America



  • BrisBricks Chandler 2016 Brisbane, Queensland, Australian, 1st-3rd October 2016 - Australia's Largest - Possibly Largest in Southern Hemisphere

See also Past Events.


Contributing QR Code
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Newly updated forums



Latest reply

Clocking Balls Per Second

Posted by Danny316p on 4 September 2016 at 07:31.
Forum: Great Ball Contraption > Great Ball Contraption Discussion

0 2

Keeping the Events list current

Posted by Danny316p on 1 September 2016 at 18:10.
Forum: Community > Community Discussion

4 36 On 3 September 2016 at 11:22
by Jack Phoenix

Table-spanning module

Posted by Captainowie on 26 September 2015 at 13:41.
Forum: Great Ball Contraption > Customs

57 2191 On 30 August 2016 at 11:07
by Torso