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[nablator]

I do not see nymphs or anything biological in the VMS. Following the interpretation of Panofsky, I only see stars, astral spirits that come down from heaven to fertilize the herbs ans transmit its virtues. To reach the Earth they have to do it through pipes and tubes. There is no other way because the universe is like an onion with solid layers of glass. It is not the fruit of my imagination. It is the Aristotelian-Ptolemaic cosmological theory.

Agreed. Also, about the theme of water flow, I don't know how widespread it was but there was a belief in a great sea above the air, "mare superior". All the water that fell from the sky in various forms: rain, snow, hail (depicted many times in the VMs exiting the tubes) had to come from somewhere. Spirits of the air and water were there to manage all these wonders somehow.