 In late antiquity, the Neoplatonist Proclus defended Plato’s account against Aristotle’s objections; these arguments are preserved in Simplicius’ commentary on Aristotle’s On the Heavens. Simplicius credits the Pythagoreans as well as Plato with a theory composing bodies from plane surfaces. Simplicius also compares Pythagorean views to Democritean atomism, inasmuch as both theories posit a cause for hot and cold rather than taking these to be fundamental principles, as the Aristotelians do.