In order to make the first idea intelligible to the beginner, (for it is difficult to consider it abstractedly even in a polygon,) we may take a cube, the three sides of which that are seen represent the light, the middle tint, and the shadow in distinct order.
To proceed again to the chiaro-scuro of a more complicated figure, we might select the example of an open book, which presents a greater diversity.
We find the antique statues of the best time treated very much with reference to these effects. The parts intended to receive the light are wrought with simplicity, the portion originally in shade is, on the other hand, in more distinct surfaces to make them susceptible of a variety of reflexions; here the example of the polygon will be remembered.—[Note FF].
The pictures of Herculaneum and the Aldobrandini marriage are examples of antique painting in the same style.
Modern examples may be found in single figures by Raphael, in entire works by Correggio, and also by the Flemish masters, especially Rubens.