Liber Alchandrei philosophi
Liber Alchandrei philosophi is a medieval manuscript of Latin musical and mathematical treatises, made around 1405 by the Virgil Master and held by the J. Paul Getty Museum, probably for scholarly readers. Its pages are ruled diagrams in red and blue ink, with tables of numbers, circles, and proportion grids, and a designer might borrow their geometric layouts, hand-drawn rules, and rubricated headings for diagram-based graphics.
