F83v2. A fascinating folio, if only because of a) the chicken scratches and b) the fact that it is, IIRC, the only place that I know of where a proper bird is drawn.
A few years ago I drew up a blogpost on this page where I compared it to You are not allowed to view links.
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If the VM author drew not one but
two identical birds in the same schemata then a very specific reason compelled him to and several years of research haven't turned up much that isn't a) esoteric and b) non-contemporary.
Now, the thing that interests me is that we can then draw a further comparison to f57v, You are not allowed to view links.
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secondary winds of Greek mythology. Albeit this was written in the first flush of youth, with some rather over-enthusiasm, which was later, very commendably, tampered by the experience and wisdom of Diane in the comments section of that blog post, and I must remember to thank her for this.
So let us carry on with this Greek idea. What other folios can we link to classic Greek explanations of physical phenomenons?