Graphic design based on the sketch of a tree by Da Vinci in his notebooks: “All the branches of a tree at every stage of its height when put together are equal in thickness to the trunk [below them].” https://en.wikisource.org/wiki/The_Notebooks_of_Leonardo_Da_Vinci

In the passage immediately following, he also observed, “All the branches of a water [course] at every stage of its course, if they are of equal rapidity, are equal to the body of the main stream.”

There's a connection to XM here; I'm sure of it ;-)
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