Reference image: Astronomical manuscript of Wenceslas IV, Prague, c. 1400. Source:Alchemy & Mysticism by Alexander Roob, TASCHEN.
Reference images: Left, "Sphere."Right,Chladni figure from Entdeckugen über die Theorie des Klanges by Ernst Florens Friedrich Chladni, 1787. Sources: Left, unknown. Right, Public Domain Image Archive.