It's just seeing - at least the photography I care about. You either see or you don't see. The rest is academic. Anyone can learn how to develop. It's how you organize what you see into a picture.
Elliott ErwittPhotography is a craft. Anyone can learn a craft with normal intelligence and application. To take it beyond the craft is something else. That's when magic comes in. And I don't know that there's any explanation for that.
Elliott Erwitt