Written as a letter to a friend, the poem catches a small, ordinary moment: the speaker is sweeping the dining room when he hears wild swans and hurries outside to watch them fly north. What follows is a long, flowing sentence that follows the birds over everything below, from train tracks and a quarry to junker cars, rugs laid out on the grass, woodchuck burrows and laundry on the line. The swans see a world of small human clutter, and the speaker imagines himself and his neighbors as dark specks, mouths open, looking up.
The mood is quiet wonder with a light, humorous touch. The speaker doesn't treat the swans as grander than his own life; he links them to a folk song and to his chores. The ending is gentle. He returns to sweeping and sweeps the dust out the door, calling it "that small blue hill." His own tiny hill echoes the far-off ones the swans are crossing.