October 9th, 2011

Order and Chaos, Escher

Clock

I seem to recall a logic puzzle presented to me when I was but a chick: so a householder has a fine grandfather clock, which keeps excellent time; s/he/* sets it every year on the summer Solstice when the sun is highest in the sky. There are other, lesser, clocks in the house, not in sight of the grandfather clock. How may these clocks be kept in time?

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That answer always left me vaguely restless, and apparently it was sufficient for me to, many years later, have (prompted by an egregious accessibility fail that reminded me of another logic puzzle about lightbulbs) come up with a few more answers:

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