He considered liability as a problem of physics. She spoke of liability as a problem of ethics. The difference was important. He had spent his life making a tradeoff between them without naming the scale.
The city would keep doing what cities do: forgetting and remembering on its own indifferent schedule. He would keep doing what he did: counting, mapping, and, when necessary, rearranging. The ledger would not absolve him of the choices he had made. But it might, just barely, force those choices to be visible.
She listened as ledger had taught him: for leaks. When he finished, she added a line to her own book, quiet and surgical.
Before the bulb died and the city fully woke, someone knocked. The knock was a punctuation that made all the ledger’s lines breathe for a moment. He opened the door.
When he worked, he found himself thinking of languages—not human tongues, but the grammars of physics and code and flesh. There were verbs useful to neurons, adjectives that only applied to cartilage, sentences you could speak to an immune system. He learned the morphology of repair: how to conjugate a membrane, how to make a synapse accept an irregular tense. In the end, what he did was little more than translation across ontologies—changing someone from one taxonomy of being into another, with all the slippage that implies.