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A coworker sent this to me...
Kinetic Marble Track Around The Top Of A Room (see first movie)
http://www.instructables.com/id/Kinetic-Marble-Track-Around-The-Top-Of-A-Room/?ref=nf
Kinetic Marble Track Around The Top Of A Room (see first movie)
http://www.instructables.com/id/Kinetic-Marble-Track-Around-The-Top-Of-A-Room/?ref=nf