Thus it is with a deaf and dumb person who, when he sees two men in conversation - although he is deprived of hearing - can nevertheless understand, from the attitudes and gestures of the speakers, the nature of their discussion.

At one side of the palette there is white, at the other black; and neither is ever used neat.

There are three aspects to perspective. The first has to do with how the size of objects seems to diminish according to distance: the second, the manner in which colors change the farther away they are from the eye; the third defines how objects ought to be finished less carefully the farther away they are.

Perspective is to painting what the bridle is to the horse, the rudder to a ship.

The color of the object illuminated partakes of the color of that which illuminates it.

How painting surpasses all human works by reason of the subtle possibilities which it contains.