humans created for the convenience of meeting people or arranging and planning. it is a way to chronicle growth and change, and it is fascinating how we take it so literally. i think the craziest example is daylight savings time. changing the clocks twice a year to manipulate what we call the hours by 1/24th? madness. the most annoying thing about daylight savings time (to me) is that everyone agrees that it is ridiculous, and yet we (for the most part) still do it. great article on the subject of time! rock on! 