There’s a neighborhood near you — maybe it’s where you grew up, maybe it’s where you go on weekends, maybe it’s just a place you drive through sometimes and feel something shift — where everything just works. The buildings come up to the sidewalk. The buildings are four or five stories, maybe six — old brick or stone, windows that open, stoops with people sitting on them. You probably don’t spend a lot of time thinking about why it feels that way. And I can tell you exactly why it feels that way — and exactly why we stopped building it.