Les manuscrits de Léonard de Vinci \
A facsimile edition of Leonardo da Vinci's notebook pages, transcribed and published in Paris in 1881 by A. Quantin, edited by Charles Ravaisson-Mollien for scholars and collectors of Italian manuscripts. The pictures are pen-and-ink sketches of optical and mechanical diagrams set among mirror-written notes on warm, aged paper, showing how Leonardo laid out ray paths, angled mirrors and spiral curves with fine hatching and lettering. A designer might borrow the loose, annotated diagram layout, the precise line weights and the sepia paper tone for technical or heritage-style graphics.
