A blog post, The Spectacle of Paris Streets, has just alerted me to a book I wish I had known about when I was researching Where the Light Falls: A Travers Paris par Crafty. For instance, I'd never thought of large trees being planted on a Parisian boulevard until I saw this image. It's the sort of sight that could cause a character to loiter, or spark a train of thought, or even somehow play into the action of a story. Or it could prompt an imaginative excursion: what if there were a world where a steampunk technology was used by trees to facilitate their own migration? The whole book is worth exploring.