Elliptical gearing is the key element of the solution.
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The TimeFlow Watch/Clock
The TimeFlow watch/clock always shows precise time, but its hands move with different angular speeds all the time! This can be simply and cheaply achieved by adding a pair of non-circular (e.g. elliptical) gears to each hand's gearing (elliptical gears are shown in color in second image). That's it. Fun, novelty, eye-catcher, conversation starter, etc..
