These are notebooks. The special thing about them is that they've got words and pictures on them that were also in the book Hyperbole and a Half. If that is something that you have always wished existed, you're in luck! You can draw pictures over the pictures, or, really, do whatever you want. Make lists of things, write down all the things you know-go nuts! You've got thee notebooks to work with (one is lined, one is blank, and one is made out of graph paper), so you're really only limited by the amount of things you can think of to do with them.