Quotation from: The Notebooks of Leonardo Da Vinci

Written by: Leonardo da Vinci

[Footnote: The three diagrams which accompany this text are placed,
in the original, before lines 7-11. At the spots marked _B_ Leonardo
wrote _Albero_ (tree). At _A_ is the word _Sole_ (sun), at _C Monte_
(mountain) at _D piano_ (plain) and at _E cima_ (summit).]

Every branch participates of the central shadow of every other
branch and consequently [of that] of the whole tree.