They discussed authentication, synthetic media, digital provenance, and the curious possibility that the oldest purpose of performance—to convince another human being that someone is truly present—had become the newest challenge of the AI era.… When the audition room fell silent, neither Arthur nor Tom looked first at the young performer standing beneath the lights. They looked at the cameras. Not one camera. Six. One broadcast camera, three vertically mounted smartphones streaming to different platforms, one AI-assisted tracking camera, and a laptop continuously generating real-time captions in multiple languages. Before a single line of dialogue had been spoken, software had already estimated the performer’s age range, vocal tempo, emotional intensity, audience retention probability, and even which facial expressions would likely become short video clips. Arthur smiled. “So this is rehearsal now.” Half a century earlier, Art...