h a l f b a k e r yReplace "light" with "sausages" and this may work...
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Through a delightfully complicated and beautiful system involving two inversely-polarized sterling engines, a complex system of gears and discs, and a backup battery, the Sterling Engine Clock tells time forever while you stare at it, contemplating the mysteries of the universe.
Beverly Clock
http://en.wikipedia.../wiki/Beverly_Clock
Driven by variations in atmospheric pressure and by daily temperature variations, running since 1864. [Spacecoyote, Mar 16 2011]
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Far more fuel-efficient than my internal combustion engine clock. [+] |
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