We can doubt that the goal is to add value, and think it is simply to give some top-down structure that makes sense to the people using it. I admit that when I

We can doubt that the goal is to add value, and think it is simply to give some top-down structure that makes sense to the people using it. I admit that when I went into the stacks to find the book I was looking tor, browsing around on nearby shelves often led to additional good finds. These were topologically near. I think that would be the case for most good grouping schemes, though the choices may change. Times have changes, the things that make sense have changed in various ways. At least it still organizes shelves.