In attempting to understand something, one needs to know what it is. In order to know what it is, it can be quite helpful to know what it is called. In this case the item is a regularly moving back and forth, with crests and troughs that are bulbous. Several adjectives, undulating, serpentine, and meandering, in particular, describe this pattern quite well. An average person could easily draw a reasonable likeness. What about drawing a nebuly line?
If we want to understand something that is (appears to be) six centuries old, then we may be helped if we knew what it was called six hundred years ago. This is where heraldry comes in. There can be no question that heraldry was socially pervasive in Europe in the 1400s and clearly predates the VMs parchment. Heraldry of this era used a number of different line patters known as heraldic lines of division.
This is a nebuly line division.
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And here in the gallery is a variety of old and new lines of division.
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What's so great about heraldic connection besides its chronological compatibility? That has to do with the word itself and its origins. If we look at the origins of undulating, serpentine, and meandering. the first derives from waves, the second from snakes, the third from a wandering river in Asia Minor. 'Nebuly' also has an etymological origin in the Latin word 'nebula' meaning a mist or cloud. And in German heraldry the equivalent term is 'gewolkt', derived from 'Wolke' meaning 'cloud' and obviously related to 'Wolkenband' or cloud band, which was a technique used by some medieval artists to represent a cosmic boundary, either in the illustration of classical or Christian deities, or in a representation of the cosmos.
While this explanation does seem antithetical to botany, it clearly does help explain the presence of the nebuly line in the VMs cosmos. The gewolkt / nebuly line possesses a cloud-based connotation and is used in the construction of a Wolkenband / cloud band representing a cosmic boundary. This was brought to VMs investigation efforts in 2014 by E. Velinska and the comparison with BNF Fr. 565 fol.23. - which is a c. 1410 reproduction of Oresme. And there is the additional similarity that both representations have a cloud bands that display 43 bulbous projections.
Incidentally, a good representation of a plain nebuly line used as a cosmic boundary, generally quite uncommon, can be found in the
Berry Apocalypse , owned by Jean, Duke of Berry (d. 1416), who also owned BNF Fr. 565.
Rather than presenting a number of individual representations required to stand or fall on their own, which tend to fail because of VMs ambiguity, I see a set of interpretations that have the potential to stand because they can lean on each other, which they do because they derive from a common tradition and history.
So despite their use in botanical illustrations, and also because of it, these first examples of nebuly lines at least call to mind (presuming they are there in the first place) the presence of nebuy lines seen on later folios. And there it shows that the VMs artist knew the cloud-based interpretation and, through the recovery of traditional terminology, we can share that same interpretation rather than an erroneous alternative, and hopefully VMs investigation moves slowly forward.