The ultimate test of maintenance is not whether we can keep repairing the past, but whether we can recognize when the future requires something new.… In October 2026, beneath the gray skies of a coastal Japanese city, a 67-year-old civil engineer named Masato Kuroda stood in the shadow of the Shiosai Bridge, watching rainwater stream through cracks in its concrete supports. The bridge had opened in 1964, during a period when the country believed that every new road, railway, and industrial complex represented another step toward an inexhaustible future. For decades, trucks carried steel, food, machinery, and construction materials across its broad deck. Commuters crossed it every morning. Children watched fishing boats from its pedestrian walkway. Generations of residents had come to regard it as a permanent feature of the landscape. Masato had spent thirty-one years maintaining it. He knew the bridge not merely as an assembly of ste...