The Magician's Nephew is the first book that had me thinking about what it would be like to be a writer.
There was a moment when I kind of felt the presence of CS Lewis behind the world I was inhabiting as if he were Aslan - I knew he was there, pulling the strings as it were, but it seemed so real. So the thought was something like: I could never do this, I can't fit all this in my head, I wouldn't have the talent. Ever. But I wished I could, and thought maybe I should write. I thought maybe I can write short stories, not whole novels.
That was 2nd grade. Or maybe 3rd grade. I kept rereading those books. It might not have been the first time through.