The state of mind of a photographer while creating is a blank...For those who would equate "blank" with a kind of static emptiness, I must explain that this is a special kind of blank. It is a very active state of mind really, a very receptive state of mind, ready at an instant to grasp an image, yet with no image pre-formed in it at any time. We should note that the lack of a pre-formed pattern or preconceived idea of how anything ought to look is essential to this blank condition. Such a state of mind is not unlike a sheet of film itself - seemingly inert, yet so sensitive that a fraction of a second's exposure conceives a life in it.
Minor White, from The Camera Mind and Eye