Following on a little from my previous post on vellum-and-parchment I found a manuscript illustration which details various aspects of book production. Here it is (Bamberg, Staatsbibliothek, Ms patr. 5; fol. 1v from In the Beginning was the Word: The Power and GLory of Illuminated Bibles ed A. Fingernagel & C. Gastgeber; Taschen, 2003, p. 21):
The Quiz element is simple: describe what is going on in each of the circles (1 is top left, 10 is bottom right).