Books do not need to be straitjacketed. Or at least, at this point in my life, my books don't. They come to no harm by being with books that are not like them. You are Tor, for instance, are not "like" each other at all. You do not fit even my "same sized stuff in a pile" rule. But the bits of you that are alike are enough to get you through the bits of you that are freakishly different.

Books are like that. They don't need straitjackets. They don't need to be organised rigidly to know where they come from.