Where Light and Derived Shadow Mingle in the Air
Mixed rays give a confused image, yet a derived shadow keeps its darkness
The page continues the study of derived shadows where light and shade overlap. Leonardo observes that when shadowy and luminous rays strike one and the same place, the result is mixed and of confused appearance. Yet the simple impact of a derived shadow does not lose its darkness even though its shadowy rays mingle in the air with luminous ones, and he notes that the right-hand figure fits this proposition. Two diagrams show cylindrical bodies casting crossing cones of light and shade between lit circles.
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Mixed rays give a confused appearance
Where shadowy and luminous rays strike one and the same place, the result is mixed and of confused appearance.
A derived shadow keeps its darkness
The simple impact of a derived shadow does not lose its darkness even though its shadowy rays mingle through the air with luminous rays. Leonardo notes that the right-hand figure suits this proposition well.