Books are just oblong inanimate objects.
Only when holding attention of a reader do the thoughts ideas stories and images of a book become something.
There is an old spiritual idea that if there is no listener then music does not exist
A musician without an audience is nothing,
likewise a book resting forever on a shelf gathering dust does not exist.
When it draws the attention of a reader,
when it gets picked out, opened and perused and affects the actions of a reader,
when a book is used,