/ · The Notebooks of Leonardo da Vinci

133

The difference between light and lustre.

[figure]

OF THE HIGHEST LIGHTS WHICH TURN AND MOVE AS THE EYE MOVES WHICH SEES THE OBJECT.

Suppose the body to be the round object figured here and let the light be at the point a, and let the illuminated side of the object be b c and the eye at the point d: I say that, as lustre is every where and complete in each part, if you stand at the point d the lustre will appear at c, and in proportion as the eye moves from d to a, the lustre will move from c to n.

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

132 * 134
II * IV
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Notebooks of Leonoardo da Vinci
III: Six books on Light and Shade.
. . .
113,
114,
115,
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
. . .