In high school I had this "kladboek" (translation: unclean book, draft version book), a book to draw or write in, to take notes in class or make drafts of assignments. Notes include French and Dutch words, pieces of Latin text filled with arrows and translations, chemical elements, cartoons, paper games (hangman; drawing lines in a big square in turn, a point and an extra turn per little square you can make) and this one thing I made during a boring "study session" (a loose hour that hadn't been filled with a lesson).
This thing is six or seven years old, but I still like it and finally decided to scan and upload it.
(I also scanned some of those schematical pieces of Latin text, if anyone is interested...)