I stipulate that it is not enough that we own a thing in the ethical/legal abstract. Perhaps it's more important, in this sense, that we value a thing, or that it is, in some sense, caught up in what we see in and as being ourselves. I submit that a certain volume on my shelf is more precious than all the others, though I paid far less for it than for all but a few. It's not the most generally useful, being a general exposition on a single field of human knowledge, but it meant so much to me when I read and understood it. That experience, and its importance to me, is what ensures that I'll keep that book handy for as long as I can. It's also the only book that, despite being a theoretical work and just begging for it, I'll never mark up. I like it just as it is.