I wanted to clarify the similarities between the roots and the vessels once again, as they were obviously not understood. This has nothing to do with my conclusion and theory; this similarity may also have a completely different explanation. But in my opinion, it exists.
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Here you can see a slender root body (black) that is slightly curved convex. From this grows (in his imagination) a narrow stem (green) that is also slightly curved concav.
The root ends, red, are similarly shaped.
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Here we have leaves in blue at the top that have a similar shape (blue circles). Below them we see a squat body, almost a barrel (black), which looks very similar. At the top is a wide open space (black circle). Many stems grow out of it (green circle)
The roots (red) have many small, thin ends.
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Here we see another leaf (blue) that has a similar shape (upside down). Again (green) there is a wide area from which a smaller pod grows, similar to the stems (small green circle)
The root (possibly young mandrake) is very bulbous, and this is also reflected in the vessel (black lines).
The root end is pointed, which also fits (red tips).
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The vessel and the plant have very similar bodies (black). The root ends are initially more complex and then become fibrous, which has a certain similarity (but only a certain one).
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In the last device, I find that what was mostly green before, i.e., belonged to the stems/leaves, also shows an interesting similarity here.
So I think that the similarities, if you go by the structure of the plant, go far beyond the normal probability of similarities.