Great Ball Contraption Trio

Via a gmail status message of O. X. Dive, a modular implementation of those Himalayas of engineering, the Great Ball Contraption:

There is (a non-lego) one in the Questacon at the Parliamentary Triangle and it was definitely one of my favourite exhibits as a young enthusiast of science and symmetry, along with (for different reasons, of course) the Tesla Coil and the Jacob’s Ladder. The music, performed by the Balanescu Quartet, is a cover of Kraftwerk’s Robots.

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