Communication = context + information. There's no communication without context. So there's no reading without interpretation directly tied to the context of the reader. You can't read the same book twice without it being different.
Also, over time, the book wears out, so someone makes a copy. Mistakes and misunderstandings creep in. Or, even, the copyist changes a few things to better fit his world view. It is possible that the book isn't as static as you think.
