To look, see and observe are different ways of using the organ of sight, each with its own intensity, even when there is some deterioration, for example, to look without seeing, when someone is distracted, a common situation in traditional novels, or to see and not notice, when the eyes out of weariness and boredom avoid anything likely to tax them. Only by observing can we achieve full vision, when at a given moment or successively, our attention becomes concentrated,