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an old but great toy made out of a glass marble or steel ball and some aluminum foil
A Marble Machine Racetrackby wordsnwood
How to Make a Marble Mazeby ChrysN
Kinetic Marble Track Around The Top Of A Roomby stevemoseley
How to make a glass marble with an embedded precision imageby ridiculously.awesome
Paper Roller Coasters :)by Biodynamic
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