I see a lot of "almost" bookshelves. They hold books and look "design-y" but they waste energy and space. If you are really into books, it's not about the cute shelves. It's about the books. Make that space hold as many as it can.
What are your thoughts on something like this for your storage wall between the middle room and sitting room? (we can design it so that each of the compartments has a particular purpose for your specific objects)