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I saw a battery-operated clock with a pendulum that swings back and forth once a second without ticking and thought, why not make a digital one that uses a magnetic sensor to count the time from the pendulum? It probably won't be as accurate as a quartz clock but would look weird in a cool way.
Digital Pendulum Clock
Don't know if it uses the pendulum for timekeeping or not. [Shz, Nov 01 2005]
Similar, but using magnets to synch the pendulum. [Shz, Nov 01 2005]