For me, it's the description, the depth, I guess you'd call it, that he gives a scene. I've always had a vivid imagination, but the way he describes a room, or a scene, or even a conversation, I can picture it, as clearly as if it were happening right in front of me. And to answer your question, so far I've read it twice, but I will continue to read this for years to come, I'm pretty sure.