Something I and my local group of conversational partners noticed (I don't have a better word for it) over the weekend: Greek philosophy was a matter of law; Theseus' Ship had tax consequences, and shifting conventions in philosophy had legal ramifications. Greek philosophy was argued in court; Sophists were lawyers who were paid to argue your case, and would argue any side whatsoever, as that was what they were paid to do. Socrates had to die, not because he was annoying important people (which he was), but because he insisted on a "pure" philosophy, and was causing all kinds of legal havoc.

It's an observation which probably isn't particularly unique, as all the clues are in just about every philosophy book I've ever read, but it's an interesting part of the history of the divergence between instrumental and epistemic rationality.