Days of creation / Scivias (Hildegard)

[CaryR]

If I am not mistaken, then on folio 225r (plate 33) Christ is shown sitting and surrounded by a mandorla. If this interpretation is correct, then there is at least one clear representation with this symbolism in the Scivas (Book I).

There is also plate 19, showing "the ruler of all" seated within a mandorla that appears to have a starry blue background (not as clearly starry as some other illustrations, but there are definitely some white dotted patterns there). So it's clear Hildegard was inspired by this popular motif, which can be found in many other sources, and at the same time she also created her own variations on this symbolism with meanings specific to her own visions.