The Voynich Pipes

[Linda]

To me the tubes show water levels and denote movement thereof, perhaps ebb and flood tides. This would be analogous with quire 13 use of tubes as rivers and springs, especially the ones held vertically, which i take to mean flood-prone, or at least that floods have occurred. 

Green water on the insides of the tubes suggest sea water to me, as opposed to lake water. But the outsides being more blue might mean they thought influx of fresh water might be involved, ie the cavern idea.

Medieval understanding of tides was incomplete but was linked to the moon, although some thought the sun, or the general turning of the heavens was involved. the latter seems to be portrayed here. 

i think the next drawing considers waves. Not sure of the third one but i would think it also discusses water movements.

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