f82v: those rainbows

[Koen G]

Might the thought of rainbows somehow "drinking", spilling or somehow transferring water explain the "fringes" at the end?

There's also a part in the Metamorphoses about a flood caused by Jupiter's anger. This part seems interesting:

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. The cornfields are flattened and saddening the farmers, the crops, the object of their prayers, are ruined, and the long year’s labour wasted.