An Extremely Well Done Marble Run With Pulleys And Levers

An Extremely Well Done Marble Run With Pulleys And Levers
We're suckers for a good, creative marble run, and this is exactly that.

https://www.youtube.com/watch?time_continue=87&utm_source=ifttt&v=QsdLiAxDLAg December 21, 2017 at 10:02PM
via Digg https://www.youtube.com/watch?time_continue=87&utm_source=ifttt&v=QsdLiAxDLAg