“Most of the identity of a dwelling lies in or near its surfaces—in the 3 or 4 feet near the walls.” These should be thick enough to accommodate shelves, cabinets, displays, lamps, built-in furniture—all those nooks and niches that allow people to leave their mark on a place. “Each house will have a memory,” Alexander writes, and the personalities of its inhabitants are “written in the thickness of the walls.” So maybe I hadn’t been that far off, imagining the walls of my hut as an auxiliary brain.