A bookworm's dream

There's an old joke, which goes something like this:

"Wow, Roger, you have such an impressive collection of books but not a single bookshelf. Why?"
"Oh, you see, I've never felt the need to borrow a bookshelf."

I was reminded of that joke when I came across this astonishing collection of bookshelves. I'd love to borrow any of them! (Hat tip: Roger Ebert).