“If you take as your pattern the wings of feathered birds, these are more powerful in structure of bone and sinew because they are penetrable, that is to say the feathers are separated from one another and the air passes through them. But the bat is aided by its membrane, which binds the whole together and is not penetrated by the air.”

— Leonardo Da Vinci

The Notebooks of Leonardo Da Vinci (1938), XVII Flight

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Leonardo Da Vinci 363

Italian Renaissance polymath 1452–1519

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The Notebooks of Leonardo Da Vinci (1938), XVII Flight

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Leonardo Da Vinci 363

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