Time

One cannot walk down an avenue, converse with a friend, enter a building, browse beneath the arches of an old arcade without meeting an instrument of time. Time is visible in all places. Clock towers, wristwatches, church bells divide years into months, months into days, days into hours, hours into seconds, each increment of time marching after the other in perfect succession. And beyond any particular clock, a vast scaffold of time, stretching across the universe, lays down the law of time equally for all. In this world, a second is a second. Time paces forward with exquisite regularity, at precisely the same velocity in every corner of space. Time is an infinite ruler. Time is absolute.

-- Einstein