Quantizing space-time

We outline a theory of space-time based on quantum mechanics and general covariance. The universe is assumed to be constructed from a non-affinely-connected differentiable manifold and acts as the arena for the dynamical forms which can be supported by it. There are only a restricted set of such forms, corresponding to particles of spin up to 2, and only a restricted set of particle symmetries [octonions combined with de Sitter symmetry broken to O(4)]. Quantum mechanics is fomulated covariantly by the functional integral method, and space and time as usually experienced is reconstructed by the classical limit of $h\to 0$. The conclusion is drawn that neither space nor time themselves can be regarded as fundamental.