Jaeger-LeCoultre Atmos ClockNot perpetual motion, but this clock never needs winding. In 1928 Jean-Léon Reutter invented the Atmos clock, driven by atmospheric temperature variations. According to Wikipedia (via Greg Ross) the original insight goes back to the seventeenth century.

 

If you're inclined to own one, be prepared for a different sort of shopping experience!

 

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