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From The Great Ball Contraption Wiki
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


See also Past Events.


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Newly updated forums



Latest reply

Page for promotional items?

Posted by Mjsweet on 17 January 2016 at 17:11.
Forum: Community > Community Discussion

3 219 On 27 March 2016 at 14:33
by Mjsweet

Table-spanning module

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

49 1103 On 18 March 2016 at 18:34
by Mr.Mario

Irreversible Screw

Posted by Torso on 22 February 2016 at 23:09.
Forum: Great Ball Contraption > Customs

3 125 On 15 March 2016 at 17:57
by Tom Atkinson