The most complex Lego creation ever
Firstly let me explain what is GBC in Lego terms. Great Ball Contraption as it is called is a Mindstorms/Technic creation in which different users usually from different geographical locations participate to create individual sections which are then included in a common display. The above creation was built by 7 Danish, Belgian, and Dutch builders with a world-record 93 mechanisms linked together. The contraption was featured at Lego World 2011 in Copenhagen.