There is geometry in the humming of the strings. There is music in the spacing of the spheres. Reason is immortal, all else mortal. And you'll see, even in the 6th century BCE, this thread of Greek thinking, putting reason at a very high level, not just trying to explain everything with pure mysticism. Although Pythagoras definitely was, and Pythagoreanism was definitely about mysticism. But it was mysticism that at the core had mathematics and geometry. But continuing on with significant mathematical contributions from ancient Greece, we have Euclid.