The library knows that it is a temporary fix. We have a stamp for the inside front cover: BROKEN SPINE NOTED. It is like a bracelet worn by a diabetic. When you return the book with this message stamped inside, we know you're not the one responsible for this horrible thing. It was some other bastard before you. The book has a preexisting condition.

An artist that makes art merely to meet a demand is a slave to what his patrons wants to see, or, hear.

The patron gets comfortable in bed and opens up the book -- it opens tentatively -- and the patron bends the open book backward until there is a satisfying crack and the book is a little more supple, a little easier to read. The book spine has just been broken, and a broken spine means a more submissive book.