While editing my myspace profile today (don't even get me started) I was looking at my "book" section. At the moment I have the two books that I'm currently reading, which is different from most pages that have a long list of favorite books. I was thinking if I should list my favorites instead, and when doing so came to the realization that a few of my favorite books are not just ones that I read and put away, but continuously read over and over again.
Looking back over the years and what I've kept in my laptop bag I've come up with a list of these perpetually read books:
I could list these as "favorite" books, but at the same time I'm always at some point in reading them, constantly learning and understanding more about them, hence perpetual.