
The Notebooks of Leonardo da Vinci (1883), III Six books on Light and Shade
Source: Practical Pictorial Photography, 1898, Illumination of clouds and the direction of light, p. 101
The Notebooks of Leonardo da Vinci (1883), III Six books on Light and Shade
Source: Practical Pictorial Photography, 1898, Composition and clouds considered as an aid to expression, p. 104
“Earth is the source of light.”
"Earth and Light," p. 57
The Sign and Its Children (2000), Sequence: “The Sign and the Dream”
Accord de différentes loix de la nature qui avoient jusqu’ici paru incompatibles (1744)
The Mystery of the Charity of Charles Péguy 5.21-29.
Poetry
Source: undated quotes, Renoir – his life and work, 1975, p. 196 : on painting landscape in open air, to art-buyer George Riviere.
January 25, 1798
Compare Wordsworth's "A Night-Piece", lines 1-16 http://www.bartleby.com/145/ww123.html.
Diaries