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Can You Guess How This Hollow Clock with Floating Hands Works?

This Hollow Clock was designed by Shinsaku Hiura, an engineering professor at the University of Hyogo. It was then 3D printed and assembled by content creator MechDesign98.

As the clock's name suggests, there is no pane of transparent material filling the circle. How, then, does the hour hand maintain its position as the minute hand rotates? Any guesses?

The answer:

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