The Roman bath was not primarily about hygiene. That framing, which modern people find intuitive, misses what made the baths central to Roman urban life for centuries. The bath was a social institution — a place where Romans of different classes shared the same water, the same space, and the same several hours of the afternoon in an arrangement that had no precise equivalent before or since. It was the forum, the gym, the library, the barbershop, and the social club compressed into a single building and made available, often for free or for a nominal fee, to virtually everyone in the city.