In 1619 Johannes Kepler printed *Harmonices Mundi Libri V* in Linz — a copperplate and woodcut treatise binding regular polyhedra, tilings, and the musical ratios of planetary orbits into one Pythagorean cosmology. This system reads its figures back in aged parchment brown: fine ocher-gold line work — nested solids, orbital ellipses, ratio brackets — floating on a deep vellum field. It is hieratic, symmetrical, generous in margin. The register is humanist Latin old-style, the gold a flat drawn line rather than a glossy sheen. Rational mysticism, rendered as geometry you can trust.