 In the Timaeus, Aristotle’s teacher Plato attempted to combine atomism with plenism as a “likely story”. The atoms are the Platonic solids (regular, convex polyhedra), each having a distinctive role in the composition of objects. Aristotle objects that the Platonic solids cannot fill space. Every arrangement of Platonic solids yields the sort of gaps that one can more readily predict in a universe composed solely of spherical atoms.