 Citizens of Magnesia, as we’ve seen, also get a sophisticated education in mathematics and astronomy. The particular results that this education aims to impart may be significant. As Ian Mueller has pointed out, incommensurability is itself a non-sensible property: two (physical) lines which represent incommensurable magnitudes will nonetheless appear to someone who measures them carefully to be  commensurable.[48]  Understanding the fact that there are some incommensurable segments thus crucially involves a grip on non-sensible properties, which is essential for coming to grasp genuine value  properties.[49]  The results aimed at in astronomical education are also significant: circular motion is the motion associated with reason and thus the circular motion of the gods is related to their status as paradigms of reason and of goodness.