Thinking about Book Art, I remembered that sometimes books don't even contain words. Take these two for example:
The Voynich Manuscript and the Mutus Liber. Neither one has any legible text and the Voynich is written in some language that was either made up or has been lost to history. The Mutis Liber is thought to be an ancient book on alchemy.
While books exist to convey information and ideas, and even sway thought, they don't always have to or even try to do so with words.