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part of the base of the t. And c is the terminal point of the
derived shadow and the chief beginning of the highest light.
[Footnote: The diagram on Pl. IV, No. 5 belongs to this passage; but
it must be noted that the text explains only the figure on the
right-hand side.]
FOURTH BOOK ON LIGHT AND SHADE.
On the shape of the cast shadows (188-191).
1
88.
The form of the shadow cast by any body of uniform density can never
be the same as that of the body producing it. [Footnote: Comp. the
drawing on PI. XXVIII, No. 5.]
1
89.
No cast shadow can produce the true image of the body which casts it
on a vertical plane unless the centre of the light is equally
distant from all the edges of that body.
1
90.
If a window a b admits the sunlight into a room, the sunlight will
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