The eye which turns from a white object in the light of the sun and goes into a less fully lighted place will see everything as dark.
Leonardo da VinciA wave is never found alone, but is mingled with as many other waves as there are uneven places in the object where the said wave is produced.
Leonardo da VinciAnd you who wish to represent by words the form of man and all the aspects of his membrification, relinquish that idea. For the more minutely you describe the more you will confine the mind of the reader, and the more you will keep him from the knowledge of the thing described. And so it is necessary to draw and to describe.
Leonardo da Vinci