How the angelic world governs the celestial

When I first saw this, I thought there were clouds painted in the alternating blue concentric rings. Closer inspection leads me to believe that it’s a more fragile pigment that has worn away differently from the other rings. Either way, it’s a stunning effect.

Jean Thenaud, Traité de la cabale Source: gallica.bnf.fr
Bibliothèque de l’Arsenal, Ms-5061 réserve, fol. 114v.