In our tiny apartment we had 3 rooms(not including the bathroom) and in those 3 rooms we had a total of 9 bookcases. There was even a bookcase in the kitchen. The bookcases were full. On each shelf, books were stacked on top of books. Vertical, and horizontal, and haphazard. On the floor in each of those 3 rooms, in front of and around the 9 bookcases, were stacks of books. Under our beds were boxes of books. In our car there were bags of books.
Now we are moved into our new house, our 9 bookcases have been joined by at least 2 more, and a coffee table, a great new place to put our books. We have one closet now dedicated to books, 3 cupboards in the kitchen full of books(no room in this kitchen for a true bookshelf), behind a chair in the living room sit 3 baskets full of library books, and still, boxes and boxes of books to be unpacked and organized.