I have an old bored retired guy problem. I am trying to organize my books after a move (see profile picture). Somewhere I have an odd box with a dozen or so books in it that we haven’t got to unpacking, it is one of dozens. Not only will I have to shift dozens of shelf feet of books to fit them in, I have also found more that I skipped while alphabetizing by author (yes, I am that guy). I am quickly running out of shelf space. It is acceptable to put them on top of other books, right? (Continued