@crocobaura that's an awesome idea, borrowing books from the library. We could even have a late return fee if they don't take them back in time :D
I always have a bookcase of some sort in my homes, but mostly it is the small book piles you can fit on surfaces.
If I have the room and it's appropriate for the sim I like to make a home office or separate study room and will then use a tall bookcase or two. And kids rooms usually get the house shaped bookcase lol.
I really really wish they were empty of books when purchased though. How annoying is it after all these years to have to keep manually deleting those same few books we always get for free... grrrr....
Also, I wish there was a way to buy books that have been written in-game by sims.
