What is the relation between a whole and its parts? Is a whole identical to its parts, or is there some other relation of composition? These questions are much discussed in modern philosophy; but Plato's rich discussion of composition has been neglected. Verity Harte provides the first sustained examination of this Platonic discussion, and shows how it can illuminate current debates. Her book is an invaluable resource both for scholars of Plato and for modern metaphysicians.