For the longest time, most of my paperbacks were randomly stored in the order I acquired them. I had the Dells and Pockets separate for years, and then I pulled out most of the Avons and Populars. Bantams were next, followed by Ace. Strangely enough, somehow Graphics were sort of self-segregating over the years… Well, recently I started to cull the Ballantines out, so I went through a box in storage that had mostly tall-format books, many of them sci-fi. When I’m done with the Ballantines, perhaps I’ll do Signets.