Yes, we were already working on stuff like this in the 90s.

But Nostr plebicizes it and actually humanizes it, again, as one Nostrich in Helsinki or Nairobi with a keen interest in Topic XYZ can do these categorizations about whatever obscure topic they are interested in.

That's why we're so excited. We want _everyone_ to be able to be a librarian. Everyone gets to assemble and categorize their own library or choose to use Npubbunchofnumbers' library.