So, I had an idea a while ago. Basically, a world where books are used as vessels for entities to live in. Every entity is part of a genre and can be 'checked out' like a book would. Some spirits are man-made (fictional stories), others are people from history (autobiographies), and some are used to keep track of things (dictionaries). There'd be librarians, of course. And humans coming to 'check out' the spirits. Feedback? Thoughts?