Colour-Coding Books

I have a very, very strange way of arranging my books. I makes complete, utter, perfect sense in my head, and I'm not sure if I can explain it very well, but I'll try.

First thing to note is that I like to alphabetise things. Anything that can be alphabetisized, really. I used to volunteer in my local library and I loved to shelve the books when I had the time. Clearly, that's the most obvious item that can be alphabetised in a library, but I would do this to the DVDs too. One of the librarians thought I was crazy, but she did admit that it made it so much easier to find what she was looking for. Of course, I'd come back every week to find it messed up again, and so I would just have to rearrange it all over again.