I am not quite sure this is cosmological. It's a detail from a ms by Hildegard von Bingen that has been discussed by You are not allowed to view links. Register or Login to view. and You are not allowed to view links. Register or Login to view. (You are not allowed to view links. Register or Login to view.). This detail is about the pyramids/mountains that appear in the the central and top-middle circles of the Rosette foldout. I will try to see if I can get any hint about their meaning from the text.
The illustrations in this manuscript are amazing: have a look if you haven't yet.
The illustrations in this manuscript are amazing: have a look if you haven't yet.