Free Einstein's Dreams by Alan Lightman Page A

law. Yet the clock could not be ignored. It would have to be worshipped. The inventor was persuaded to build the Great Clock. Afterwards, he was killed and all other clocks were destroyed. Then the pilgrimages began.
    In some ways, life goes on the same as before the Great Clock. The streets and alleyways of towns sparkle with the laughter of children. Families gather in good times to eat smoked beef and drink beer. Boys and girls glance shyly at each other across the atrium of an arcade. Painters adorn houses and buildings with their paintings. Philosophers contemplate. But every breath, every crossing of legs, every romantic desire has a slight gnarliness that gets caught in the mind. Every action, no matter how little, is no longer free. For all people know that in a certain cathedral in the center of Rome swings a massive bronze pendulum exquisitely connectedto ratchets and gears, swings a massive bronze pendulum that measures out their lives. And each person knows that at some time he must confront the loose intervals of his life, must pay homage to the Great Clock. Each man and woman must journey to the Temple of Time.
    Thus, on any day, at any hour of any day, a line of ten thousand stretches radially outward from the center of Rome, a line of pilgrims waiting to bow to the Great Clock. They stand quietly, reading prayer books, holding their children. They stand quietly, but secretly they seethe with their anger. For they must watch measured that which should not be measured. They must watch the precise passage of minutes and decades. They have been trapped by their own inventiveness and audacity. And they must pay with their lives.

• 20 June 1905
    In this world, time is a local phenomenon. Two clocks close together tick at nearly the same rate. But clocks separated by distance tick at different rates, the farther apart the more out of step. What holds true for clocks holds true also for the rate of heartbeats, the pace of inhales and exhales, the movement of wind in tall grass. In this world, time flows at different speeds in different locations.
    Since commerce requires a temporal union, commerce between cities does not exist. The separations between citiesare too great. For if the time needed to count a thousand Swiss franc notes is ten minutes in Berne and one hour in Zürich, how can the two cities do business together? In consequence, each city is alone. Each city is an island. Each city must grow its own plums and its cherries, each city must raise its own cattle and pigs, each city must build its own mills. Each city must live on its own.
    On occasion, a traveler will venture from one city to another. Is he perplexed? What took seconds in Berne might take hours in Fribourg, or days in Lucerne. In the time for a leaf to fall in one place, a flower could bloom in another. In the duration of a thunderclap in one place, two people could fall in love in another. In the time that a boy grows into a man, a drop of rain might slide down a windowpane. Yet the traveler is unaware of these discrepancies. As he moves from one timescape to the next, the traveler’s body adjusts to the local movement of time. If every heartbeat, every swing of a pendulum, every unfolding of wings of a cormorant are all harmonized together, how could a traveler know that he has passed to a new zone of time? If the pace of human desires stays proportionally the same with the motion of waves on a pond, how could the traveler know that something has changed?
    Only when the traveler communicates with the city of departure does he realize he has entered a new domain of time. Then he learns that while he has been gone his clothing shop has wildly prospered and diversified, or his daughter has lived her life and grown old, or perhaps his neighbor’s wife has just completed the song she was singing when he left his front gate. It is then the traveler learns that he is cut off in time, as well as in space. No traveler goes back to his city of