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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.
1
34.
OF PAINTING.
Heigh light or lustre on any object is not situated [necessarily] in
the middle of an illuminated object, but moves as and where the eye
moves in looking at it.
1
35.
OF LIGHT AND LUSTRE.
What is the difference between light and the lustre which is seen on
the polished surface of opaque bodies?
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