It's difficult to know where to begin, sir.' 'Yes, the beginning is the tricky part. But perhaps there is no beginning, perhaps we can't look that far back.' He got up from his desk and went over to the window, from where he could see thin pillar of smoke rising into the clouds. 'I never know where anything comes from, Walter.' 'Comes from, sir?' 'Where you come from, where I come from, where all this comes from.' And he gestured at the offices and homes beneath him. He was about to say something else but he stopped, embarrassed; and in any case he was coming to the limits of his understanding. He was not sure if all the movements and changes in the world were part of some coherent development, like the weaving of a quilt which remains one fabric despite its variegated pattern. Or was it a more delicate operation than this - like the enlarging surface of a balloon in the sense that, although each part increased at the same rate of growth as every other part, the entire object grew more fragile as it expanded? And if one element was suddenly to vanish, would the others disappear also - imploding upon each other helplessly as if time itself were unravelling amid a confusion of Sights, calls, shrieks and phrases of music which grew smaller and smaller? He thought of a train disappearing into the distance, until eventually only the smoke and the smell of its engine remained.