When you look at a wall spotted with stains...you may discover a resemblance to various landscapes, beautiful with mountains, rivers, rocks, trees. Or again, you may see battles and figures in action, or strange faces and costumes, and an endless variety of objects which you could reduce to complete and well-drawn figures.
Leonardo da VinciOf several bodies, all equally large and equally distant, that which is most brightly illuminated will appear to the eye nearest and largest.
Leonardo da Vinci