Here’s a great design idea that I haven’t seen being applied in any library. Book shelves that are also stairs. An easy way of getting the book you want. It’s just one of those designs that makes you wonder “why didn’t I think of that?”
If take a minute to ponder about it, it is not all that hard to build. You could even try to do it yourself, using some wood and some nails. Also works for categorizing CD’s. Nice!