The origin of the base shapes of the Voynich alphabet

[RenegadeHealer]

That's true, but they can't be both left at the same time.

Interestingly enough, ambidextrous people might better be called ambisinistrous, because at the neurological and embryological (developmental) levels, left-handed and naturally ambidextrous people belong in one category together, with right-handed people in another. One the effects of this is that ambidextrous people often display a lot of the same distinctive writing habits as left-handed people, even when writing with their right hands. And while most ambidextrous people can, with practice, exert the same writing or drawing intention with both hands simultaneously, the ability to write or draw two completely unrelated things with each hand simultaneously is far rarer even than ambidexterity itself. I wouldn't be surprised if many ambidextrous people who've lived since writing was invented have made their living as copyists and scribes, since they could potentially produce copies of a text at twice the rate of almost all colleagues.

So could the VMS have been written by the right hand of an ambidextrous scribe who leaned his glyphs to the left out of habit? Sure. There's a lot there for Occam's Razor to cut off, but it's not at all outside the realm of possibility.

Source: Am a medical doctor who had a great neurology professor in med school. I also did a research report about handedness when I was 13, after breaking my right hand and being forced to learn to write with my left hand for a couple of months. I've always had a huge fascination with the human body and how it works, and that ended up being a very fun rabbit hole to go down. I can dig up some PubMed references if anyone is interested in reading more about this.