A pattern language
Alexander and his co-authors present us with over two hundred (roughly 250) "patterns" that they believe must be present in order for an environment to be pleasing, comfortable, or in their words, "alive." The patterns start at the most general level -- the first pattern, "Independent Regions," describes the ideal political entity, while another of my favorite patterns, "Mosaic of Subcultures," described the proper distribution of different groups within a city. The patterns gradually become more specific -- you'll read arguments about how universities should relate to the community, the proper placement of parks, the role of cafes in a city's life. If you wonder about the best design for a home, the authors will describe everything from how roofs and walls should be built, down to how light should fall within the home, where your windows should be placed, and even the most pleasant variety of chairs in the home. An underlying theme of all the patterns is that architecture, at its best, can be used to foster meaningful human interaction, and the authors urge us to be aware of how the houses we build can help us balance needs for intimacy and privacy.