 This argument is not Newton’s, neither the premises nor conclusion, and must not be taken as a historically accurate reading, However, that is not to say that the argument is fallacious, and indeed many have found it attractive, particularly as a defense not of Newton’s absolute space, but of Galilean spacetime. That is, Newtonian mechanics with Galilean spacetime can explain the phenomena associated with rotation, while theories of the kind proposed by Mach cannot explain the differences between situations allowed by Newtonian mechanics; but these explanations rely on the geometric structure of Galilean spacetime – particularly its affine connection, to interpret acceleration. And thus – the argument goes – those explanations commit us to the reality of spacetime: a manifold of points whose properties include the appropriate geometric ones. This final doctrine, of the reality of spacetime with its component points or regions, distinct from matter, with geometric properties, is what we earlier identified as ‘substantivalism’.