 Here is one suggestion. Keeping Homer clung only to his Muse,and Ion clung only to Homer, preserves the idiosyncrasy that let Socrates deny expertise to Ion. For otherwise a magnet and rings would show how genuine knowledge is transmitted. Suppose you say that a Muse leads the doctor Hippocrates to diagnostic insights that he tells his students and they tell theirs. That much divine help is all that the image of magnet and rings strictly implies, and it is no threat to a profession’s understanding of itself. But no one would claim that a doctor can learn only from a single other doctor, or that a doctor treats a unique group of adulatory patients. That constraint on medical practice would threaten its status as technê; and that is exactly the constraint added by the array of rings as Socrates describes it. (For a contrasting and compelling reading of this passage see Chapter 3 of Capra 2015.)