139.
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The Da Vinci Notebooks at sacred-texts.com
139.
p. 83
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.
Footnotes
83:61 : A here stands for levante (East), B for ponente (West).
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