William Wordsworth's poem "Upon Westminster Bridge" is a depiction of the sublime, characterized here by the early morning as viewed from Westminster Bridge in London. Its key themes are beauty in tranquillity and the harmony of the man-made with the natural world, particularly at liminal times of day when, as in the early morning, the world is deserted and still.
Wordsworth was much preoccupied with the idea of the sublime and its connection to tranquillity, and this theme can be seen in many of his poems. In "Upon Westminster Bridge," he describes how "the City doth, like a garment, wear / The beauty of the morning: silent, bare." This beauty encompasses "ships, towers, domes, theatres and temples," all "bright and glittering in the smokeless air." It is notable that the air is "smokeless," as this is contrary to what might be expected in London at that time, a city of heavy industry. Wordsworth suggests that it is in repose that the city is most beautiful, rather than when it is in the midst of its daily work. The poet indicates that he has never "felt a calm so deep" as in this early morning.