Index to the Book of Light and Shade: chapters 604-622
Chapter headings from Leonardo's Treatise on Painting, keyed to the leaves where each topic is treated.
A table-of-contents leaf of the Codex Urbinas listing numbered chapter headings 604 to 622 with cross-references to the leaves (a carte) where each is discussed. The running head reads 'Parte', part of the 'Parte Quinta' opening, the fifth part of the treatise devoted to shadow and light. The entries concern derived (cast) shadow: how a shadowed body generates as many shadows as the lights around it, why a cast shadow differs in size from its cause, and where derived shadow is darkest.
On this page
Derived shadow: its nature, boundaries and darkest zones
Successive headings treat where the derived shadow is darkest (606), how each shadowed body generates as many shadows as the luminous parts surrounding it (609), the nature of derived shadow (617), its shapes (618) and boundaries (620), and derived shadow generated within another derived shadow (619).
Why a cast shadow differs in size from its cause
Headings 612 to 616 explain that the body nearer the light casts the larger shadow, why a shadow larger than its cause is of discordant proportion and has blurred edges, and how a separated (cast) shadow is never equal in size to the object that produces it.