Why are there 60 seconds in a minute. There is a tremendous hunger for information about time. Rather than be a spoil sport, I thought it might be interesting to say the millennium is no different than when you turn 21 or when you turn 40 or when you turn 60. This is a problem, because there is no definition of time. Time changes depending on who you're talking to, depending on what culture you come from, depending on what age you come from.
Time is intellectually completely abstract.
Nevertheless, we have tangible signs that time must exist. So I think it's this combination between having something that is incredibly intellectually profound but at the same time can be measured, can be weighed, can be chopped up into little bits. That's like asking a mother which one is her favorite child. You like them all for different reasons. For example, we have a little miniature from the Biblioteque National that shows how medieval man was struggling to come to terms with the beginning of time, the passage of time and the end of time.