You know how it feels when you read a book and it sticks with you? You think about it when you aren't reading it. You're excited to get back to it, to crack open the binding and lift our your bookmark and let your eyes turn pure black and white into live action like a movie in your head.
And when you finish the book you still think about it. About how it made you feel. Or about what you learned. Or you recall your favorite part with a smile.
You replay the story in your head and think: "Wow. What a good book."
I call it book residue. That powerful pull that links you emotionally to a story. I strive for it in my own work, but I love it when someone else's words grab a hold of me that way too.
It makes reading so much more than just reading.