Das Buch von der Malerei nach dem Codex Vaticanus (Urbinas) 1270
This is a German edition of Leonardo da Vinci's treatise on painting, edited by Heinrich Ludwig and published in Vienna by W. Braumüller in 1882 from the Codex Urbinas. Its pictures are plain line diagrams of optics and perspective: mirrored rays, reflected light paths, and geometric constructions drawn with fine hatching and lettered points. A designer might take from them a clear, diagrammatic vocabulary of rays, circles, and labelled construction lines.
