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Time exists everywhere in the universe, but occupies no space.
Time can be measured - but not seen, heard, smelled, tasted, nor held in our hands.
It can be spent, saved, frittered away or killed - but it cannot be destroyed.
These ancient timepieces are evidence of our enduring fascination with time.
Though they date from long ago, they point the way to watches, clocks, calendars of today -and the revelations about time that still lie ahead.