Sometimes, true synchronization meant knowing that information traveled at different speeds—and deliberately moving at the right moment so that two separate signals would finally arrive together.… The rehearsal hall stood at the edge of a vast outdoor stage. Fifty meters away, rows of seats waited beneath the evening sky. In the center of the stage, Aoi, a professional dancer, was rehearsing a new performance with a live band. The choreography was built around perfect synchronization. Every turn, jump, and gesture was carefully aligned with the beat of the music. The choreographer, Mr. Kanda, watched the performance through a monitor. “Again,” he said. “Your timing was perfect—but somehow it still feels slightly wrong.” Aoi frowned. “How can perfect timing feel wrong?” Kanda pointed toward the empty seats. “Imagine sitting there.” Aoi walked to the front row and looked back at the stage. Kanda asked the band to play a single sh...