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A little wonder, every day

How Leonardo reasoned about the blue sky

AI-generated historical reconstruction of Leonardo considering atmospheric blueness through a smoke-and-dark-background observation; not a documentary image or a specific manuscript page.
red-chalk drawing of a bearded man traditionally identified as a possible Leonardo self-portrait; attribution is disputed.
Leonardo’s *Virgin of the Rocks*, an example of his atmospheric landscape painting.
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AI-generated historical reconstruction of Leonardo considering atmospheric blueness through a smoke-and-dark-background observation; not a documentary image or a specific manuscript page.

Listen to fact0:00 / —

In his notes, Leonardo da Vinci considered why the air appears blue. He explained it as sunlight illuminating the atmosphere against the darkness beyond it, and proposed testing the idea with sunlit smoke against a dark surface. This was an early attempt to explain the phenomenon, not a complete modern theory of light scattering.