In the past few years, we have covered plenty of unique clocks. If you happened to be alive in the 80s and 90s, chances are you remember some of the rare clocks that used to be sold at gift shops. Take the Time Machine for instance: it is a marble run clock that uses an arm to pick up tiny balls and put them on a track to display the time. There were made in various colors. We were able to get our hands on a black and 2x UV blacklight ones.
These clocks have a very similar design but two of them react to blacklight in the dark. They have a mechanism that times the ball pick up perfectly to make sure the marble run can keep track of time. These clocks were also sold in DIY kit, so you could assemble them in a few minutes and learn a thing or two about marble runs in the process.
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