I've seen it. No new theory. No new research. Just another 'idea'.
A conscientious researcher mentions first enunciation of any conclusion they use, and even of some 'ideas' though mainly as a matter of honesty and transparency - claiming credit to which one is not entitled, whether tacitly or overtly is the final shame.
Of course, no-body would actually try to claim credit for an 'idea', Of course.
If we had to credit 'ideas' Newton would have to say that his law of gravity was 'idea' of the first hominid who said "Apple... falls"..

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So, seriously. Professor Irwin Panofsky is to be credited here. He was a specialist in analytical evaluation of art, and especially trained and experienced in medieval art and manuscripts, chiefly German Christian and then Italian renaissance.
He said - in 1931 - that the imagery in the Vms derived from neither of those traditions. Or rather, he implied this by attributing it to Jews of 'Spain or somewhere southern'.
From that time until I began noticing details in the imagery which had no other origin or counterpart, Panofsky's evaluation had been unknown or ignored - as far as I can discover.
I found no evidence that anyone had looked into any aspect : no research into the codicology or palaeography of Jewish manuscripts, no investigation of Jewish botanical drawings, astronomical texts, characteristic habits in art, literature of sciences ...
nothing. No preliminary investigation means no conclusion from that research and its evidence. No-one to credit from 1931- until a few years ago. So far as I could find. -
The Friedmans assumed the Voynich manuscript was the unique creation of a sixteenth century, European and Christian 'author' whom they presumed created the text in cipher. Their only interest in the manuscript lay in the challenge of 'breaking' the written part of the text - to which all the imagery was assumed potentially an aid - but evidently of no independent worth from their point of view.
d'Imperio's booklet is now very badly out of date on many points, including this one. It shows clearly that the Friedman group interpreted 'Jewish' as meaning a written source of some text on magic from which that imagined Christian, European 'renaissance' or 'enlightenment' author had derived his cipher.
Until I disputed Ellie's interpretation of one of the 'bathy' folios - first in a comment and then a separate post - explaining to her that in no sense: not in content, style, habits or ways of seeing the world, did the manuscript's imagery evince Christian origin, such a thing had never been said or accepted in Voynich studies except by implication by Panofsky - whose opinion was effectively just ignored. Again - happy to know better if you know.
Response from Ellie and her friends and associates at that time was of a kind which also made clear to me, as to everyone else, that this was until then an unheard-of opinion. That's why I wrote the first blogposts: I simply couldn't believe that others really believed what they very plainly did - and which they also thought obvious. I don't recall any comment correcting their point of view, or referring to earlier research into this manuscript. I still think it was the first time that had been said, and the reasoning and evidence informing that opinion explained.
Never mind: everyone seems to believe it now, even if some don't know what brought such a radical change in so short a time. Its now more thing that I can add to the 'things certainly known' page on my blog.
We advance.