Making lists and diagrams out of long reads is not a 21st century student invention. It is one of the most common forms of marginalia found in medieval manuscripts.
Image: Deventer, Athenaeumbibliotheek, 101 F 23 KL (12th c): diagram, 13th century

Making lists and diagrams out of long reads is not a 21st century student invention. It is one of the most common forms of marginalia found in medieval manuscripts.

Image: Deventer, Athenaeumbibliotheek, 101 F 23 KL (12th c): diagram, 13th century