Bookcase Order

So, I figured it would be a good idea to go through all of my books and reorganise them and get rid of some of my older ones which I'm never going to read again. So I have. I have a stack of books on the landing, which looks like it would equate to about two/three shelves worth and have just managed to get all of my books onto my three bookcases and a couple of other shelves without them stacking up too much. Provided you ignore the fact that I have massive piles on top of the bookcases. Anyway, I'm quite proud of myself now. I think I deserve to buy myself a couple of books as a reward. But then where would I put them?!