Don't you see that the eye embraces the beauty of the entire world? It is a window of the human body, through which the soul speculates and enjoys the beauty of the world, accepting the prison of the body which, without this power, would be a torment... The admirable necessity! Who would believe that such a small space would be capable of absorbing the images of the universe? The painter's spirit must become similar to a mirror that adopts the color of what it looks at and fills itself with as many images as there are things in front of it. -Leonardo da Vinci