Speaking of specific details...
I've always felt that the "towers" on the "map" folio were meant to be containers. Towers don't have feet, they don't have super narrow "stems", they usually have windows or slits, onion-dome technology was almost unknown in the west at the time, and the way the lines are arranged on the globes is not the way they do it on towers. Plus the tops look more like finials on containers than tower roofs.
So, for a long time I thought maybe the "containers" were symbolic of spices that were used in a sacred place that had towers (e.g., some kind of temple) and that the shapes were intended to serve both purposes.
But where did the person get the
idea to draw it this way? Maybe they got it from here. Maybe those are archway entrances at the base of the tower (which is round, a shape that was often used for lighthouses), but they are so small, they look like feet if you have containers on your mind...