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Open book with a drawing of a triangle on it

PD12M

Open book with a drawing of a triangle on it

The image shows an open book with a drawing of a triangle on it, which is believed to be Leonardo da Vinci's sketchbook of the universe.

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The image shows an open book with a drawing of a triangle on it, which is believed to be Leonardo da Vinci's sketchbook of the universe. The book is open to a page with text and diagrams, providing a detailed look at the intricate details of the drawing.

Credit: Wikimedia Commons
License: https://creativecommons.org/publicdomain/mark/1.0/

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