That said, I do know the way I would file photo books in my ideal library: Alphabetically. Not because it makes things easy to find, but because alphabetical order mixes order and chaos in a wonderfully arbitrary way.
In a photo library, alphabetical order creates improbable neighbors. Lange butts up against LaChapelle. Sander follows Samaras. Wall, Waplington. Davidson, Day. These photographers have nothing to do with each other, yet on the bookshelf they are neighbors. On the shelf there are no categories, no division by subject, seemingly no sense at all to the sequence. Chance is in control. And yet ask me to find a certain book and I know exactly where to look.
When have order and chaos been so unified?
Ever listen to an iPod song list in alphabetical order? It's a beautiful thing. When else are you going to hear "Wrong Time Capsule", "Wrong Way", "Wrote a Song For Everyone" in sequence, or follow Big Star with Bikini Kill and Bill Cornett? I think one could construct entire radio shows from alphabetical songs. The order would be precise, yet no one could guess what was coming. Random shuffle crossed with a crystal ball.
Alphabetical order is like walking around with a camera, with no way of knowing what you'll find, yet suspecting some deeper underlying pattern. Sometimes you know exactly where to look. Sometimes you don't.