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1
16.
Let a be the light, b the eye, c the object seen by the eye
and in the light. These show, first, the eye between the light and
the body; the 2nd, the light between the eye and the body; the 3rd
the body between the eye and the light, a is the eye, b the
illuminated object, c the light.
1
17.
OF PAINTING.
OF THE THREE KINDS OF LIGHT THAT ILLUMINATE OPAQUE BODIES.
The first kind of Light which may illuminate opaque bodies is called
Direct light--as that of the sun or any other light from a window or
flame. The second is Diffused [universal] light, such as we see in
cloudy weather or in mist and the like. The 3rd is Subdued light,
that is when the sun is entirely below the horizon, either in the
evening or morning.
1
18.
OF LIGHT.
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