On London and the Houses in It by Hilaire Belloc

The aspect of London, as the man who knows it grows older, begins to take on characters of permanence and characters of change, both of which are comparable to those of a human life. It is perceived that certain qualities in the great soul of the place are permanent, and that the memories of many common details merge after the passage of years into a general picture which is steadfast and gives unity to the whole.

This is especially true of the London skies, and more true, I think, of the London skies in autumn than at any other season of the year. Men go home from the City or from the Courts westward at an hour which is that of sunset, when the river catches more light than at any other time: the mixture of mist and smoke and of those shapes in our clouds, beyond the reek of the town, which are determined by the south-west wind blowing up the line of the valley, make together an impression which is the most lasting of the landscapes in which we live. These it was which inspired Turner when he drew them from the deserted room in the tower of Battersea Church, or from that corner house over the River, whence he could watch evening after evening the heavy but transparent colours which enter into the things he painted.