I’ve seen about an expansion in the early 20th century that’s continued and read about how Natural Science split into Science and Philosophy around the 18th century I think? There were the schools in 12th century Italy which I think were based upon the few fragments of Aristotle they had. [it expanded when the Byzantians (well, Gemistus Pletho) gave them the classical knowledge which sparked an explosion in European knowledge… There’s the School of Constantinople during the Byzantine era but it always seemed like a finishing school rather than split up into subjects. Prior to that is Roman Empire… prior to that is Greece and Ancient Greece… and prior to that is Egypt — and China was doing things in a similar time scale but without the big gaps… I need to brush up on this myself: https://en.wikipedia.org/wiki/History_of_education Also: I love your quadrant. It is food for thought indeed!