Is your book piling up and irregular? Books that are left piling up just like that, can physically damage the book. In addition, the house feels cramped and dense, so it makes us not comfortable to linger at home.
When we look for books that are needed it also feels difficult because they have to search among other books. The house which is a paradise, and a palace for us, of course, must be neat, clean, beautiful to be comfortable to live in.