Chapter Five: The Temperature of the Beak Needle

At the third step, every droplet stopped. Lin understood that the passage tested whether he could separate experience from measurement. He calculated molecular vibration and inferred energy flow from phase boundaries. The illusions tore at him, but he advanced only when reproducible data permitted it. At the needle, the droplets formed a question: How could hot and cold water reach equal temperature without increasing total entropy? "It cannot," Su said. "Not in a closed system." The ruin wanted a boundary condition, not a formula. "Expand the system," Lin said. "The city is not closed. It exports entropy into the Deep." The needle entered his chest. The world became gradients.