In the You are not allowed to view links.
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Then Koen pointed out that it might not necessarily be an attempt at depicting an object, but just something weird with the coloring, since we can find in the same pool a nymph where the hollow is filled in with green and another where it is left blank:
Now while filling the hollow in with green makes sense, and leaving it blank can be attributed to sloppiness, filling it in with beige is clearly a deliberate choice. In any case, this got me looking at "arm hollows" a bit more closely. Oddly enough, it's clear that the illustrator was paying careful attention to exactly what is depicted within these spaces.
Take a look at this pair of nymphs from f81r:
The front lock of hair on the nymph standing in the back is strange in that it's abnormally long and is extended out at a large angle from the top of her head. And as we can see, the lock of hair ends up in the arm hollow of the nymph directly in front. The illustrator must have drawn the hair this way because it was important that the hair be shown within the arm hollow.
Now look at this pair of nymphs from f75r:
This time it's a nymph's leg that's abnormally elongated and again it winds up the arm hollow of the nymph in front. It seems like this must have been deliberate.
Now if we turn to the pages of the Zodiac section where the nymphs are standing in cans, we can find that sometimes the arm hollow is filled in with dots, and sometimes it isn't:
Looking at just these two examples, it seems like the dots are just the interior surface of the can, which is visible in the arm hollow in the first example due to the strange way the can has been drawn, and not in the second example. We can provide further evidence for this view from looking at another example:
Here the nymph is standing at one side of the can, so we can clearly distinguish the interior surface of the can and see that it is in fact filled with dots.
Thus far it seems like everything can be explained by whether the inner surface of the can is visible or not, but now look at this one:
If we look under the right arm hollow (from our perspective), the rim of the can is clearly visible... yet there is also a row of four dots
above the rim. Obviously these dots cannot be explained as a simple depiction of the interior surface of the can. It must have been important to the illustrator that dots be shown in the arm hollow for some other reason, and the awkward bend in the arm also suggests that it was drawn with this purpose in mind. Interestingly we also see four dots in the other arm hollow, yet no can rim is visible, even though it seems like it should be there.
There are some other oddities regarding arm hollows, such as in this example:
Here there's an odd beige stripe behind the nymph's head that winds up in the arm hollow. Is it the nymph's hair? It doesn't appear to be, because her hair is generally not colored in. Yet again it seems that something is done simply to influence what is depicted inside the arm hollow.
Anyway, this list of peculiarities does not exhaust the observations that can be made regarding arm hollows, but I think it suffices to prove that the illustrator was certainly thinking about this. I have no idea what it means, so naturally I welcome any further observations or parallels that can be found in other works of art.