Branching Beyond Leonardo: The Evolution of Tree Architecture Theory

The piece explores how people have tried to understand the structural rules behind tree growth, beginning with Leonardo da Vinci’s observations. One principle in his notebooks holds that, at any height, the combined thickness of a tree’s branches equals the thickness of its trunk. This describes tree form as governed by an underlying relationship between trunk and branches, rather than as an arrangement of unrelated limbs. The title frames Leonardo’s idea as an early point in the development of tree-architecture theory and signals an interest in how later thinking has moved beyond it.

Leonardo’s curiosity is presented alongside his artistic and scientific work, and the account begins with a visit to Château du Clos Lucé, where he spent his final years after accepting an invitation from King Francis I in 1516. He died there in 1519, aged 67, with gardens and towering trees outside his room. Their canopy prompts reflection on the natural forms he studied. The enduring appeal of his rule lies in its ability to connect close observation of trees with a general claim about their growth - an idea that continues to interest both scientists and artists.