Determined to make it happen for reasons I’ll never understand, this is a video of Youtuber Engineezy designing and building a machine that harvests the energy of falling marbles to charge a phone. Does the device consume more electric energy lifting the marbles than it produces? What do you think?

The brainchild of maker of things Ivan Miranda, this is a giant 3D printed marble clock that tells time using black and white marbles as a dot matrix display. The clock features a marble elevator, at the top of which it uses an array of infrared sensors to determine black

Available as a 3D printable file from JBV Creative, this sine wave machine features marbles that roll in a sine wave as the machine is cranked. Hate cranking? Get creative and add a motor. Or a car engine! JBV also sells the file for a wave machine that’s only 8

Marble machines: I’ve been making them since my age was in the low single digits. Granted those were all made out of children’s wooden blocks and the marble usually got stuck somewhere I couldn’t see, but I consider myself an expert on the subject nonetheless. This is a very impressive