Three Pensioners Gather at the Trench.

The municipality opened a trench on my street in March, and by the following morning the trench had acquired a faculty. Three men, none of them younger than seventy, stood at its rim in the position the whole continent recognizes: feet apart, chin lifted, hands clasped behind the back like a diploma. They had not been invited. They had not, as far as I could establish, met before; yet they arranged themselves at regulation intervals, as though the correct distance between inspectors were codified somewhere, and they began, without a word passing among them, to supervise.

Everything about the posture rewards study. The clasped hands come first: they are the uniform, and also the oath. Hands held behind the back declare that their owner will not be lifting anything, passing anything, or assisting in any capacity; that he is present in a strictly judicial role. The lean is calibrated to the exact degree that separates interest from involvement. And the face performs the real work: a long, slow scan of the excavation, a pause at the point of error, and then the smallest possible shake of the head, directed at no one, entered into no record, and yet somehow legally binding.

By the second day they had opinions. "Too much water in that concrete," one of them observed, to the horizon. The horizon did not dispute it. Another disagreed about the depth of the gravel bed, and the disagreement was conducted entirely in eyebrow, over the heads of the men actually digging, who had learned long ago that the tribunal assembled above them could be neither answered nor appealed.

The Italians, who catalogue the human comedy the way botanists catalogue orchids, have the word for these men: umarell. It is Bolognese dialect for "little man," carried into national fame by the writer Danilo Masotti around 2005 and since admitted into the dictionaries, which is the procedure by which a joke becomes an institution. Bologna sells umarell figurines now; one town has named a small square for its watchers; and construction firms in several countries have begun cutting round windows into their site hoardings at the average height of a seventy-four-year-old, having grasped that the watching will occur regardless and might as well be comfortable. There are reports, which I choose to believe, of a seaside municipality placing its umarells on a token stipend, thereby making official what was always the case: they were on duty.

It would be easy to file all this under nostalgia, old men missing their working lives, haunting the nearest scaffolding the way ghosts are said to haunt the houses they were happiest in. The theory collapses on contact with the evidence. Observe an umarell for an hour and you will detect no longing whatsoever to climb down into the trench. He has spent forty years in trenches, actual or bureaucratic; he has been supervised his entire life by foremen, managers, and inspectors of inspectors; and now, at last, the economy has released him into the senior role. Supervision is not his substitute for a career. It is the promotion the career was for.

His expertise, moreover, is genuine, which is what makes him unbearable and indispensable in equal measure. A man who laid pipe for four decades can hear wrong sand. He can look at a fresh weld the way a violinist looks at a student's bow arm. The foreman on my street, a large and initially sarcastic person, was heard by the entire neighborhood on the fourth day asking the tallest of the three inspectors whether the old water main ran under the linden or beside it, because the maps disagreed, and the man with his hands behind his back had been present, as a young digger, in 1978, when the main went in. The trench found the pipe precisely where he said it would be. The nod he permitted himself afterward would have looked immodest on a general.

Honesty requires the admission all the same: most of what the inspectors contribute is nothing, and the nothing is the contribution. Work that is watched becomes, in some small degree, performance, and performance carries standards that mere labor shrugs off. The diggers on my street dug slightly straighter for their audience. They cursed with more artistry and less venom. A wet spring morning that might have justified an early retreat to the van somehow did not justify it in front of the faculty. An economist would call this an externality. The rest of us can call it what the village always called it: behaving, because somebody's grandfather is looking.

Beneath the comedy, and at the risk of pressing a suit onto a pleasure, the umarell is the last full believer in a proposition the rest of us have quietly abandoned: that public works are public. The road is being dug with his taxes, in his street, for his water. Every other citizen experiences the trench as an inconvenience lying between two private errands. He alone attends it as an owner attends his own affairs, which is what he is. Attention, in his hands, becomes a civic instrument: unpaid, unrequested, occasionally infuriating, and incorruptible, since a man wants nothing from the world while his hands are clasped behind his back. Municipal accountability has been theorized by some very fine institutions. On my street it was practiced by three pensioners and a thermos.

Retirement, as our societies have arranged it, is the day a man is informed that his attention is no longer required anywhere. The pension arrives, the calendar empties, the telephone goes quiet in the middle of the week. The inspectors have simply declined the verdict. Nobody requires their attention, so they have assigned it themselves, the way a judge left without cases might walk down to the port and begin acquitting ships. It is idleness of the highest order, activity wearing every ornament of purpose while pursuing none, and I have examined it from several angles and can find nothing in it to correct.

The trench on my street was filled at the end of April. Asphalt went over it, black and tidy, and the diggers packed their van and drove off to open a hole somewhere luckier. The faculty dispersed the same afternoon, without ceremony, satisfied with a job well done, the job having been the watching. Only the tallest of them lingered. He stood over the fresh patch for a long moment, hands where they belonged, and studied it with the expression of a man reading a promissory note. The patch will sink a little by winter; a corner of it will crack. He knows this the way he knew about the linden.

He will be there.