Alchemical Symbolism in the VMS

[nablator]

[Jupiter] let loose the south wind [...] When he crushes the hanging clouds in his outstretched hand there is a crash, and the dense vapours pour down rain from heaven. Iris, Juno’s messenger, dressed in the colours of the rainbow, gathers water and feeds it back to the clouds.

Omitted descriptions of clothing for obvious reasons. Read image right to left (the way the figures are facing).

That was my initial guess for the interpretation of Q13: the cycle of water (a mystery at the time, not well understood until centuries later), with or without allegories directly taken from Ovid's Metamorphoses. This one is particularly fitting, good find!

No reason why it can't be both about water and alchemy.