Came accross this interesting water based clock system. Below are some details from wikipedia.

The Clock of Flowing Time is a 13 meter high water clock extending over three floors in the Berlin Europa-Center. The clock was designed by the French artist Bernard Gitton and set up in 1982.

The Clock of Flowing Time in Berlin
The water clock displays the time by filling glass spheres with brightly colored liquid, in a cycle that repeats every 12 hours. The whole system is controlled by a pendulum swinging in the lower half of the clock.

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