Just thought you'd like to see some of the books in my office. There is no rhyme or reason to the organization of them and as you can see I don't stand them up in the way you'd expect. Laying them on their sides two deep allows me to shelve many more.
Of course when I need to look for a particular book I have some difficulty seeing the ones in the back. But I remove, let's say, 3 of the books in the front at a time, then look behind, take another 3, then look. I never take more than 9 books into my arms at any one time.
All this and I was a book indexer in an earlier life.