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Let n be the source of the shadow e f; it will assume its hue.
Let o be the source of h e which will in the same way be tinged
by its hue and so also the colour of v h will be affected by p
which causes it; and the shadow of the triangle z k y will be
affected by the colour of q, because it is produced by it. [7] In
proportion as c d goes into a d, will n r s be darker than
m; and the rest of the space will be shadowless [11]. f g is
the highest light, because here the whole light of the window a d
falls; and thus on the opaque body m e is in equally high light;
z k y is a triangle which includes the deepest shadow, because the
light a d cannot reach any part of it. x h is the 2nd grade of
shadow, because it receives only 1/3 of the light from the window,
that is c d. The third grade of shadow is h e, where two thirds
of the light from the window is visible. The last grade of shadow is
b d e f, because the highest grade of light from the window falls
at f.
[
Footnote: The diagram Pl. III, No. 1 belongs to this chapter as
well as the text given in No. 148. Lines 7-11 (compare lines 8-12 of
No. 148) which are written within the diagram, evidently apply to
both sections and have therefore been inserted in both.]
2
76.
OF THE COLOURS OF SIMPLE DERIVED SHADOWS.
04
2
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