“Time isn’t running out. It’s not even real,” he said, and I knew I had lost him—he was lost, circling in his own mind. “It’s just a measure of distance we made up to understand things. Like an inch. Or a mile.” He moved his hands as he spoke, to accentuate the point. “That clock,” he said, pointing behind him. “It’s not measuring time. It’s creating it. You see the difference?”