 Once one sees beyond the technicalities, Lewis’s notion of natural languages approximates to the ordinary notion of languages as things we use to communicate with others in a linguistic community. Chomsky’s notion of a language as an object internal to the human mind or brain can seem odd from this perspective. We can dispel this sense of oddity by appreciating the scientific project from which this usage of “a language” emerges. The fact that a usage fails to mesh with ordinary thinking hardly constitutes an objection to the usage if the project housing it is a good one. Ordinary thinking would struggle to accept mass as one of energy’s possible forms, but this gives physicists no cause to pause.