The tubes, as I have already said, are an essential part of the Voynich's conception. In addition to those I have already mentioned in previous posts, we see tubes in the cosmological diagrams on folios You are not allowed to view links.
Register or
Login to view. and f69v. In the latter, the tubes are more clearly defined—resembling organ pipes, like those seen in the Rosettes foldout.
On f69v, we also see a large central star with points that fill the entire circle, set against a background filled with small stars. All of this suggests the channeling of astral influence through the tubes.