 Second, quantum mechanics describes the world in terms of values of variables at specific discrete times. This second aspect of discreteness is directly accounted for by the sparse (or “flash”) ontology of RQM. The history of a quantum particle, for instance, is neither a continuous line is spacetime (as in classical mechanics), nor a continuous wave function on spacetime. Rather, with respect to any other system it is a discrete set of interactions, each localized in spacetime.