The first object of the painter is to make a flat plane appear as a body in relief and projecting from that plane
Leonardo da VinciThere shall be wings! If the accomplishment be not for me, 'tis for some other. The spirit cannot die; and man, who shall know all and shall have wings.
Leonardo da VinciThere is no object so large but that at a great distance from the eye it does not appear smaller than a smaller object near.
Leonardo da Vinci