Life in the city is lived in daily patterns of mobility. Each day, most of us stroll past the same shops and cafés, or distractedly gaze across receding rooftops from the vantage of an elevated train. We often think of time spent in transit as lost time, life on the periphery of real living. But as the French anthropologist Marc Augé has shown us, traveling through the city is a practice of history and memory. Instead of life lost, cities unfold at the stop-and-go pace of a crowded bus line. Along the way, monuments to the city’s collective history spark personal, individualized memories. In those fleeting moments, as the bus rolls along, we may be struck by the memory of a childhood trip to Central Park or suddenly recall a moment of heartbreaking loss. On the commute, the past and the present intermingle in barely recognized flashes of illumination, all in the time it takes to glance up from the morning newspaper.