‘Sounds feasible,’ Conrad commented, his interest mounting. ‘But how did they enforce all this?’

‘By a system of coloured passes, coloured money, an elaborate set of schedules published every day like the TV or radio programmes. And, of course, by all the thousands of clocks you can see around you here. The subsidiary hands marked out the number of minutes remaining in any activity period for people in the clock’s colour category.’

Stacey stopped, pointed to a blue-faced clock mounted on one of the buildings overlooking the plaza. ‘Let’s say, for example, that a lower-grade executive leaving his office at the allotted time, 12 o’clock, wants to have lunch, change a library book, buy some aspirin, and telephone his wife. Like all executives, his identity zone is blue. He takes out his schedule for the week, or looks down the blue-time columns in the newspaper, and notes that his lunch period for that day is 12.15 to 12.30. He has fifteen minutes to kill. Right, he then checks the library. Time code for today is given as 3, that’s the third hand on the clock. He looks at the nearest blue clock, the third hand says 37 minutes past — he has 23 minutes, ample time, to reach the library. He starts down the street, but finds at the first intersection that the pedestrian lights are only shining red and green and he can’t get across. The area’s been temporarily zoned off for lower-grade women office workers — red, and manuals — greens.’

‘What would happen if he ignored the lights?’ Conrad asked.

‘Nothing immediately, but all blue clocks in the zoned area would have returned to zero, and no shops or the library would serve him, unless he happened to have red or green currency and a forged set of library tickets. Anyway, the penalties were too high to make the risk worthwhile, and the whole system was evolved for his convenience, no one else’s. So, unable to reach the library, he decides on the chemist. The time code for the chemist is 5, the fifth, smallest hand. It reads 54 minutes past: he has six minutes to find a chemist and make his purchase. This done, he still has five minutes before lunch, decides to phone his wife. Checking the phone code he sees that no period has been provided for private calls that day — or the next. He’ll just have to wait until he sees her that evening.’

‘What if he did phone?’

‘He wouldn’t be able to get his money in the coin box, and even then, his wife, assuming she is a secretary, would be in a red time zone and no longer in her office for that day — hence the prohibition on phone calls. It all meshed perfectly. Your time programme told you when you could switch on your TV set and when to switch off. All electric appliances were fused, and if you strayed outside the programmed periods you’d have a hefty fine and repair bill to meet. The viewer’s economic status obviously determined the choice of programme, and vice versa, so there was no question of coercion. Each day’s programme listed your permitted activities: you could go to the hairdresser’s, cinema, bank, cocktail bar, at stated times, and if you went then you were sure of being served quickly and efficiently.’

They had almost reached the far end of the plaza. Facing them on its tower was the enormous clock face, dominating its constellation of twelve motionless attendants.

‘There were a dozen socio-economic categories: blue for executives, gold for professional classes, yellow for military and government officials — incidentally, it’s odd your parents ever got hold of that wristwatch, none of your family ever worked for the government — green for manual workers and so on. But, naturally, subtle subdivisions were possible. The lowergrade executive I mentioned left his office at 12, but a senior executive, with exactly the same time codes, would leave at 11.45, have an extra fifteen minutes, would find the streets clear before the lunch-hour rush of clerical workers.’

Stacey pointed up at the tower. ‘This was the Big Clock, the master from which all others were regulated. Central Time Control, a sort of Ministry of Time, gradually took over the old parliamentary buildings as their legislative functions diminished. The programmers were, effectively, the city’s absolute rulers.’

As Stacey continued Conrad gazed up at the battery of timepieces, poised helplessly at 12.01. Somehow time itself seemed to have been suspended, around him the great office buildings hung in a neutral interval between yesterday and tomorrow. If one could only start the master clock the entire city would probably slide into gear and come to life, in an instant be repeopled with its dynamic jostling millions.

They began to walk back towards the car. Conrad looked over his shoulder at the clock face, its gigantic arms upright on the silent hour.

‘Why did it stop?’ he asked.

Stacey looked at him curiously. ‘Haven’t I made it fairly plain?’

‘What do you mean?’ Conrad pulled his eyes off the scores of clocks lining the plaza, frowned at Stacey.

‘Can you imagine what life was like for all but a few of the thirty million people here?’

Conrad shrugged. Blue and yellow clocks, he noticed, outnumbered all others; obviously the major governmental agencies had operated from the plaza area. ‘Highly organized but better than the sort of life we lead,’ he replied finally, more interested in the sights around him. ‘I’d rather have the telephone for one hour a day than not at all. Scarcities are always rationed, aren’t they?’

‘But this was a way of life in which everything was scarce. Don’t you think there’s a point beyond which human dignity is surrendered?’

Conrad snorted. ‘There seems to be plenty of dignity here. Look at these buildings, they’ll stand for a thousand years. Try comparing them with my father. Anyway, think of the beauty of the system, engineered as precisely as a watch.’

‘That’s all it was,’ Stacey commanded dourly. ‘The old metaphor of the cog in the wheel was never more true than here. The full sum of your existence was printed for you in the newspaper columns, mailed to you once a month from the Ministry of Time.’

Conrad was looking off in some other direction and Stacey pressed on in a slightly louder voice. ‘Eventually, of course, revolt came. It’s interesting that in any industrial society there is usually one social revolution each century, and that successive revolutions receive their impetus from progressively higher social levels. In the eighteenth century it was the urban proletariat, in the nineteenth the artisan classes, in this revolt the white collar office worker, living in his tiny so-called modern fiat, supporting through credit pyramids an economic system that denied him all freedom of will or personality, chained him to a thousand clocks…’ He broke off. ‘What’s the matter?’

Conrad was staring down one of the side streets. He hesitated, then asked in a casual voice: ‘How were these clocks driven? Electrically?’

‘Most of them. A few mechanically. Why?’

‘I just wondered… how they kept them all going.’ He dawdled at Stacey’s heels, checking the time from his wristwatch and glancing to his left. There were twenty or thirty clocks hanging from the buildings along the side street, indistinguishable from those he had seen all afternoon.

Except for the fact that one of them was working!

It was mounted in the centre of a black glass portico over an entranceway fifty yards down the right-hand side, about eighteen inches in diameter, with a faded blue face. Unlike the others its hands registered 3.15, the correct time. Conrad had nearly mentioned this apparent coincidence to Stacey when he had suddenly seen the minute hand move on an interval. Without doubt someone had restarted the clock; even if it had been running off an inexhaustible battery, after thirty-seven years it could never have displayed such accuracy.

He hung behind Stacey, who was saying: ‘Every revolution has its symbol of oppression.