by Marie Curie 
Da Vinci Notes 14: The Rule of Trees
All the branches of a tree at every stage, put together, equal the trunk. I measured it on an elm, counted the leaves round a cherry shoot, and read the years in a sawn bough.
Leonardo's rule that a tree's branches together equal its trunk, the sixth leaf above the first, tree rings and the north side, and light in leaves for painters.
Leonardo da Vinci
November 8, 2026
29 min