VMs f75r - Nymph Holding Spurtle

[Barbrey]

None of the other rainbow iconography fits the little rainbow on f75r

I’m sorry, but I don’t share your opinion; to me it’s not a rainbow, but rather a depiction of a sort of channel; it looks like a bridge or aqueduct carrying water or some liquid toward the river where the nymphs are bathing.

That’s fine, it’s one of the worst things about the VMS that the drawings are sometimes difficult to identify just as real things, let alone symbols. I base my opinion upon the other rainbows in this section, however, which are drawn the same way. I guess it could be argued that none of them are rainbows either?  It would be nice if the colourist had painted more than one or two colours though.