The Notebooks of Leonardo Da Vinci

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Page 139 of 1565.
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Every shadow with all its variations, which becomes larger as its
distance from the object is greater, has its external lines
intersecting in the middle, between the light and the object. This
proposition is very evident and is confirmed by experience. For, if
_a b_ is a window without any object interposed, the luminous
atmosphere to the right hand at _a_ is seen to the left at _d_. And
the atmosphere at the left illuminates on the right at _c_, and the
lines intersect at the point _m_.

[Footnote: _A_ here stands for _levante_ (East), _B_ for _ponente_
(West).]

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