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159

Definition of derived shadow.

Shadow is diminution of light.

Darkness is absence of light.

Shadow is divided into two kinds, of which the first is called primary shadow, the second is derived shadow. The primary shadow is always the basis of the derived shadow.

The edges of the derived shadow are straight lines.

The darkness of the derived shadow diminishes in proportion as it is remote from the primary shadow.

Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.

158 * 160
II * IV
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Notebooks of Leonoardo da Vinci
III: Six books on Light and Shade.
. . .
139,
140
Light and shadow with regard to the position of the eye.
141,
142,
143,
144,
145
The law of the incidence of light.
146,
147
Gradations of strength in the shadows.
148,
149
light.
150,
151,
152
On the proportion of light and shade.
153,
154,
155,
156,
157
Definition of derived shadow.
158,
159
Different sorts of derived shadows.
160,
161,
162
On the relation of derived and primary shadow.
163,
164,
165
On the shape of derived shadows.
166,
167,
168,
169,
170,
171,
172,
173,
174
On the relative intensity of derived shadows.
175,
176,
177,
178,
179
. . .