Chap. CLXXXVIII.—Advice to Painters.
Be very careful, in painting, to observe, that between the shadows there are other shadows, almost imperceptible, both for darkness and shape; and this is proved by the third proposition[1], which says, that the surfaces of globular or convex bodies have as great a variety of lights and shadows as the bodies that surround them have.
- ↑ Probably this would have formed a part of his intended Treatise on Light and Shadow, but no such proposition occurs in the present work.