I like nosing at other people's collections, some nice ones here.
Mine has a multitude of different orders involved. All hardbacks on the bottom shelf, 1st order is height, then width except for Mr Mercedes and finders keepers. My paperbacks are also in height order 1st, then publisher style, then if there are multiple books of the same style, alphabetical order. I'm currently reading dreamcatcher, when I've finished it will slot in before everything's eventual as it's the same style and begins with "D". I'm starting to see how weird I appear.
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I badly need space, I don't like lying books on top of standing books. My books on the middle shelf are so tightly packed that they all move when I pull one. I might see if the dark towers fit in my small unit and move my Clarkson books elsewhere.