The Life clock, by Bertrand Planes runs on a “clock mechanism slowed down 61320 times” so that each number represents years. – Link
Marco writes in asking – “How does one make one of these?”
Well, besides having highly reliable components – I’d imagine the clock hands could be animated by stepper motors which in turn are driven by a microcontroller/realtime clock . . . hmm, any readers care to step in here?
This might come in handy, for starters:
Relatime clock module with calendar accurate up to year 2100 – Link
Clock of the long now from Bay Area Maker Faire ’07 – Link
From the Maker store:
LED Clock kit – Link