Quotation from: The Notebooks of Leonardo Da Vinci
Written by: Leonardo da Vinci
OF THE ACCIDENTS OF COLOURING IN TREES.
The accidents of colour in the foliage of trees are 4. That is:
shadow, light, lustre [reflected light] and transparency.
OF THE VISIBILITY OF THESE ACCIDENTS.
These accidents of colour in the foliage of trees become confused at
a great distance and that which has most breadth [whether light or
shade, &c.] will be most conspicuous.