In this paper I examine a much discussed passage of the Timaeus. This passage contains one of the most important descriptions of Plato\u27s ontology to be found in all the dialogues. The ontological scheme there described differs from that presented in the middle Platonic dialogues in that a third sort of entity, the Receptacle or space, is added to the two classes of things familiar to readers of the Phaedo and Republic: Being (i.e. the Forms) and Becoming (the phenomenal world). The introduction of the Receptacle into Plato\u27s ontology enables Plato to clarify the relation between the orders of Being and Becoming in a way not otherwise possible. When the relation between the Forms and their phenomenal counterparts has been clarified, I ...