What A Writer Sees That The Reader Doesn't

"You come up with an image, phrase or sentence. Your head snaps back, and you say to yourself, Where did that come from?! I’m not talking about automatic writing, though that may be part of it. I mean the entire range of invisible forces that produce and affect the work. There are things the writer sees that the reader does not; things the reader sees that the writer does not; and things neither of us ever sees. These, the most entrancing of the lot, have a power of their own. Li