File:LEGO GBC 8 Made by Philip Verbeek.png

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=What’s a LEGO GBC?= Of all the things made with Lego, my favorites are inevitably the Great Ball Contraptions. GBCs, as they are known for short, are Rube Goldberg-style machines designed with the sole purpose of moving tiny balls through a circuit. The GBC is an elegant ballet of Lego, and the ultimate contruction feat of these balls as well as their robotic NXT counterparts. The mechanisms that move the balls through the loop are generally as complex as possible, using clever actions that are reminiscent of the workings of a factory right out of How It’s Made.

The GBC should not be confused with a Rube Goldberg machine, though. This device is not accomplishing a particular task — it’s just keeping the balls rolling. Each module of the machine has been carefully designed to efficiently move the balls individually or in groups on to the next component. At the end it all starts over again.

I think, the Great Ball Contraption is just about the greatest feat of Lego engineering that there is. The combination of planning, ingenuity, and commitment required to put together a truly Great Ball Contraption, is as well that level of even dedicated Lego fans.

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