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The lights which may illuminate opaque bodies are of 4 kinds. These
are: diffused light as that of the atmosphere, within our horizon.
And Direct, as that of the sun, or of a window or door or other
opening. The third is Reflected light; and there is a 4th which is
that which passes through [semi] transparent bodies, as linen or
paper or the like, but not transparent like glass, or crystal, or
other diaphanous bodies, which produce the same effect as though
nothing intervened between the shaded object and the light that
falls upon it; and this we will discuss fully in our discourse.
Definition of the nature of shadows (119--122).
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19.
WHAT LIGHT AND SHADOW ARE.
Shadow is the absence of light, merely the obstruction of the
luminous rays by an opaque body. Shadow is of the nature of
darkness. Light [on an object] is of the nature of a luminous body;
one conceals and the other reveals. They are always associated and
inseparable from all objects. But shadow is a more powerful agent
than light, for it can impede and entirely deprive bodies of their
light, while light can never entirely expel shadow from a body, that
is from an opaque body.
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