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Rube Goldberg Machines
Websites
This Rube Goldberg Machine will turn on a blue-light thereby revealing a hidden message in 47 steps.
http://www.y3k.com/rube.html
Information about Rube Goldberg, his drawings, his machines, and contests.
http://www.rgmc.com
Amusing to watch artistic contraptions.
site exerpt
Machines are complicated and ingenious, but utterly useless pieces of machinery that automate the process of playing with marbles. With these machines, mankind is free to pursue more productive ends, while leaving the playing with marbles to his trusty automated...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/index.html