Helge made an interesting LEGO clock that uses ping-pong balls and Lego Technic to keep track of time. One thing that makes this clock different from the rest, is his way of transporting the balls to the top of the clock.
Every minute a fan starts up and blows a new ball from the reservoir at the bottom, through the long tube and up to the uppermost tray.
A more modern looking LEGO Rolling ball clock – Link
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