My personal subtitle for this book:
Chronodiegetic science-fiction using the example of applied book-reader-interaction with a focus on metaphysics and philosophy.
Books are time machines. Or in Charles Yu's words:
"I.e. it is possible, in principle, to construct a universal time machine from no other components than (i) a piece of paper that is moved in two directions through a recording element, backward and forward, which (ii) performs only two basic operations, narration and the straightforward application of the past tense."
I loved this book.
Now, if you'll excuse me, I have to go and feed my ontological cat.