[matiasz]

I think Chomsky is referring to gravity’s action at a distance, which Newton regarded to be absurd. I’ve heard Chomsky say that, after Newton, “physical” has come to mean “what we more or less understand” — that is, the physical is no longer identical to the material (body), in the sense of a world filled with nothing but billiard ball–like atoms bumping into each other. In the quotation above, Chomsky says that John Locke understood these points, so it may be worth looking at his work.