In my own work, when I start off writing a scene, I don't know which physical details are going to turn out to be meaningful. But, inevitably, certain images will stand out - you start to decide which ones are important as you go.
I just kind of like to feel myself into stuff by writing scenes and seeing what characters end up saying.
I'm still happy with the way Einstein's Dreams came out. That book came out of a single inspiration. I really felt like I was not creating the words, that I was hearing the words. That someone else was speaking the words to me and I was just writing them down. It was a very strange experience. That can happen with a short book. I don't think it could happen with a long book.
When asked how she knows when her writing is where she wants it to be: "I know when it's the best I can do. It may not be the best there is. Another writer may do it much better. But I know when it's the best I can do. I know that one of the great arts that the writer develops is the art of saying, 'No. No, I'm finished. Bye.' And leaving it alone. I will not write it into the ground. I will not write the life out of it. I won't do that."
I do tend to think that I've written a great deal out of my unconscious because half the time I don't know what a given character is going to say next.
For me, when I start a novel, I only have a general sense of what I am going to do - usually three or four big scenes or something to which I can really respond emotionally.
I wrote 'Zeuglodon' on a whim. I found myself writing the voice of an 11-year-old girl. I don't know why.
I have found that the characters in my novels stay with me after a book has ended. I know them in some sense. I never map anything out. I just think until I am secure in the voice of one of them, and then let the character unfold.
That instinct for human character that is perhaps inherent in an imaginative writer.