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


  • LEGO World Netherlands, Utrecht, NL, October 21–27, 2015.
  • HispaLUG Expo, Zaragoza, SP, November 7-8, 2015.
  • Brick 2015, London, UK, December 11–13, 2015.


See also Past Events.



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Newly updated forums



Latest reply

Ask questions here

Posted by ALittleSlow (administrator) on 11 February 2015 at 04:22.
Forum: Community > Wiki help

23 566 On 23 November 2015 at 11:58
by Mjsweet

Maico's events...

Posted by Maico on 11 May 2015 at 10:17.
Forum: Great Ball Contraption > Customs

35 755 On 16 November 2015 at 06:56
by Maico

Posted by ALittleSlow (administrator) on 14 November 2015 at 04:02.
Forum: Community > Wiki help

0 9