As a kid, my favorite outdoor activity was riding the see-saw at the park around the corner from my house. It was just about the most idyllic thing that I remember from back then. Flash forward twenty or so years, and now I'm basically a gigantic, walking word-nerd (who, incidentally, still loves see-saws). Put those two passions together, and the result is one of the most amazing bookshelves I've ever seen:
[Price upon request, Generate]
My only concern about this see-saw bookshelf is that one day I would defy all semblance of ceremony, toss the books to the floor, and bounce up and down to my heart's content. My downstairs neighbors would not be pleased.
Related: Book Storage Doubling as Objet d'Art, This Bookshelf Will Blow Your Mind