 A relatively rich set of testimonia, many from authors of the fourth century BC, indicate that Archytas wrote other books as well. Archytas’ famous argument for the unlimited extent of the universe (A24), his theory of vision (A25), and his account of motion (A23, A23a) all suggest that he may have written a work on cosmology. Aristotle’s comments in the Metaphysics suggest that Archytas may have written a book on definition (A22), and A20 and A21 might suggest a work on arithmetic. Perhaps there was a treatise on geometry or solid geometry in which Archytas’ solution to the problem of doubling the cube (A14–15) was published. There is also a tradition of anecdotes about Archytas, which probably ultimately derives from Aristoxenus’ Life of Archytas (A7, A8, A9, A11). It is possible that even the testimonia for Archytas’ argument for an unlimited universe and his theory of vision were derived from anecdotes preserved by Aristoxenus, and not at all from works of Archytas’ own.