A manuscript from the 770s containing excerpts from Boethius, Cassiodorus, Isidore of Seville (St. Gallen, Stiftsbibliothek, Cod. Sang. 125)
A wheel is important because by turning it turns other things too. An axle is just as important because otherwise, the wheel would be, well, freewheeling, going everywhere and nowhere. Without a linchpin, however, n…