The front of the white lectern has a slight blue tinge, since it is lit mainly by the refracted light of the sky rather than the yellowish direct glow of the setting sun.59 “Shadows will vary,” Leonardo explained in his notebooks. “The side of an object that receives a reflected light from the azure of the air will be tinged with that hue, and this is particularly observable in white objects. That side that receives the light from the sun will partake of that color.

Walter Isaacson Quotes

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