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OF PAINTING.
You will observe in drawing that among the shadows some are of
undistinguishable gradation and form, as is shown in the 3rd
[
proposition] which says: Rounded surfaces display as many degrees
of light and shade as there are varieties of brightness and darkness
reflected from the surrounding objects.
2
38.
OF LIGHT AND SHADE.
You who draw from nature, look (carefully) at the extent, the
degree, and the form of the lights and shadows on each muscle; and
in their position lengthwise observe towards which muscle the axis
of the central line is directed.
2
39.
An object which is [so brilliantly illuminated as to be] almost as
bright as light will be visible at a greater distance, and of larger
apparent size than is natural to objects so remote.
The effect of light or dark backgrounds on the apparent size of
objects (240-250).
185
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