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Rube Goldberg Machine
This Rube Goldberg Machine by Jacob Shwirtz turns on a blue-light thereby revealing a hidden message in 47 steps.
http://www.jacobshwirtz.com/RubeGoldberg/i...
Marble Machines
Amusing to watch artistic contraptions.
http://www.sentex.net/~mwandel/marbles/ind...
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