“But if pressed, I’d have to say that what I love most about the subways of New York is what they do not do. One may spend a lifetime looking back—whether regretfully or wistfully, with shame or fondness or sorrow—and thinking how, given the chance, things might have been done differently. But when you enter a subway car and the doors close, you have no choice but to give yourself over to where it is headed. The subway only goes one way: forward.”