/ · The Notebooks of Leonardo da Vinci

136

The relations of luminous to illuminated bodies.

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The middle of the light and shade on an object in light and shade is opposite to the middle of the primary light. All light and shadow expresses itself in pyramidal lines. The middle of the shadow on any object must necessarily be opposite the middle of its light, with a direct line passing through the centre of the body. The middle of the light will be at a, that of the shadow at b. [Again, in bodies shown in light and shade the middle of each must coincide with the centre of the body, and a straight line will pass through both and through that centre.]

[Footnote: In the original MS., at the spot marked a of the first diagram Leonardo wrote primitiuo, and at the spot marked c—primitiva (primary); at the spot marked b he wrote dirivatiuo and at d deriuatiua (derived).]

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

135 * 137
II * IV
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Notebooks of Leonoardo da Vinci
III: Six books on Light and Shade.
. . .
116
Different sorts of light.
117,
118
Definition of the nature of shadows.
119,
120,
121,
122
Of the various kinds of shadows..
123,
124,
125
Of the various kinds of light.
126,
127
General remarks.
128,
129
On the nature of light.
130,
131
The difference between light and lustre.
132,
133,
134,
135
The relations of luminous to illuminated bodies.
136
Experiments on the relation of light and shadow within a room.
137,
138,
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
. . .