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The importance of light and shade in the perspective of
disappearance (235-239).
2
35.
An opaque body seen in a line in which the light falls will reveal
no prominences to the eye. For instance, let a be the solid body
and c the light; c m and c n will be the lines of incidence of
the light, that is to say the lines which transmit the light to the
object a. The eye being at the point b, I say that since the
light c falls on the whole part m n the portions in relief on
that side will all be illuminated. Hence the eye placed at c
cannot see any light and shade and, not seeing it, every portion
will appear of the same tone, therefore the relief in the prominent
or rounded parts will not be visible.
2
36.
OF PAINTING.
When you represent in your work shadows which you can only discern
with difficulty, and of which you cannot distinguish the edges so
that you apprehend them confusedly, you must not make them sharp or
definite lest your work should have a wooden effect.
2
37.
184
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