Honestly, Brian knew very little about libraries. He knew that they had books, and that late fees could really screw you over. But he didn't know how they were organized beyond the Dewey Decimal System, which he knew vaguely had to do with numbers. Though it perhaps didn't seem to be all that interesting, he listened intently anyway. It was, after all, only polite.
"Well, what matters is that you're interested in it. It sounds pretty neat, actually." He smiled. "I think people take libraries for granted. They're such a staple in any neighborhood, it's like...they just show up, pre-formed, and run themselves."