Looking around my room, I also seem to have around 80 or so books, and they take up more space in my house than most other stuff. :)

For books, I mostly go digital nowadays, but, I make exceptions for:

- "books I want on my bookshelf",

- "books that changed my life",

- books that I just found while looking around in a bookstore.

So far, my bookshelf has classics, novels I really liked, some nice reference books and textbooks, and a few nonfiction books. I am usually more reluctant to stack up on nonfiction physically; they usually get summarized and put into Evernote as points to be looked back at later.

Either way, I strongly feel that everyone has their own unique "bookshelf", collections of books they live by. So asking others would definitely be interesting. Looking forward to the other responses. :)