Voynich, Hill, Crumb: A Hitherto Vexing Codex
datagubbe.se
datagubbe.se
The parchment is calfskin. In the medieval era, it was uncommon for noblemen to slaughter their livestock for anything, even food, unless exceedingly special occasions. That book would have probably cost at least as much as one or two small farms, which is money only noblemen had, and far more than a lord or even a king would have afforded save for some extreme circumstances or investment.
The painter examples don't seem compelling to me either. The Voynich Manuscript is illustrated in a style that is reminiscent (to me) of old texts. There are lots of naked women, but not so many that I'd describe it as pathological.
I suspect it is a clever cipher, a constructed language, or a forgotten language.
It's possible the Voynich Manuscript is the ramblings of an insane person but I don't think that is particularly likely. If my guess is right, and the statistical properties of the characters in the book indicate that it is part of a language or language-like system somehow, then we would have no more reason to suspect it was authored by a crazy person than any other random book.
In both cases it just means the author started out knowing how to use some tool contemporary to them. It doesn't prove or disprove either meaningfulness or nonsense.
And the TempleOS example specifically illustrates that we're not talking a out a binary state.
In my view the TempleOS example is an example of sense versus non-sense. This is the difference between someone explaining that they have to take out their own teeth because they think the CIA hid radios in there and someone just making incoherent sound. The former is crazy, sure, but it's crazy made out of words that convey intent. If a schizophrenic told you they needed to remove their teeth to silence the radios in them you'd have a good guess about what the schizophrenic person was about to do. Again, not true for the person making incoherent noises.
And, again, not binary.
And maybe coherence isn't binary (not that I ever wrote it was) but TempleOS is clearly an example of something that is coherent though done by mentally ill person for an irrational purpose.
That process happened over a period of time and many different writings. A single document might well seem consistent.
Recently a Turkish scholar has found indications that it is old Turkish.
https://www.openculture.com/2019/02/has-the-voynich-manuscri...
They certainly make the claim, but I haven't found any evidence that their approach is being given much credence.
A XVth century schizophrenic would have had at least one natural language, and could therefore have, consciously or less so, made up another one.
EDIT: If successful it may perhaps still be deciphered; if the descent into illness had gone too far it may not actually make any sense to be decoded out of it -- but still look like a "real" language.
Someone crafted the book to make it seem mystical, which they could then use to influence someone somehow.
Probably not for money. It seems like it was created by a wealthy educated individual who didn't need money. More likely for political reasons; to manipulate and gain power.
The author is evidently a fan of Gödel, Escher, Bach: an Eternal Golden Braid ...
I'm also partial to xkcd's explaination: https://xkcd.com/593/
0: https://en.wikipedia.org/wiki/Codex_Seraphinianus
1: https://blog.kolesnik.info/pictures/files/Codex_Seraphinianu...