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expresses itself in pyramidal lines. The middle of the shadow on any
object must necessarily be opposite the middle of its light, with a
direct line passing through the centre of the body. The middle of
the light will be at a, that of the shadow at b. [Again, in
bodies shown in light and shade the middle of each must coincide
with the centre of the body, and a straight line will pass through
both and through that centre.]
[Footnote: In the original MS., at the spot marked a of the first
diagram Leonardo wrote primitiuo, and at the spot marked
c--primitiva (primary); at the spot marked b he wrote
dirivatiuo and at d deriuatiua (derived).]
Experiments on the relation of light and shadow within a room
(
137--140).
1
37.
SHOWS HOW LIGHT FROM ANY SIDE CONVERGES TO ONE POINT.
Although the balls a b c are lighted from one window,
nevertheless, if you follow the lines of their shadows you will see
they intersect at a point forming the angle n.
[
Footnote: The diagram belonging to this passage is slightly
sketched on Pl. XXXII; a square with three balls below it. The first
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