Think back to highschool and collage when you'd sit in class as your teacher dissected sections of Shakespeare or a passage in James Joyce's A protrait of an artist as a young man. You'd take notes in the margins, highlight passages, and basically write all over your book, so you could go back and reference them when you write your essay.
I stopped doing this when my university days were done, but I have a friend (an author of three books), who still does this. When she lent me a few books, there were lines drawn all over it and sections that were circled.
A few years ago, I couldn't even imagine writing in a book, but now I'm starting to think it's not such a bad idea, especially due to my lack of memory.
How many times have you been reading and thought that's a great way to describe that, or I like how the author did that, but when you go back and try to find it, well, you know, you can't.
I've been reading a non-fiction book these past few weeks and I've used a pencil crayon as a book mark. I've been highlighting those passages I find interesting, funny, or thought provoking. I think its a practice I'm going to continue.
How about you? Do you write in books?