Why the rosettes image may not be a map at all

[Koen G]

A random thought. The apparent accuracy and architectural detail in these little buildings keeps surprising me. I'm not ashamed to admit that I can't draw like the images on the large foldout. The same goes for the folio with the two birds, those are actually really well drawn and the items on that page seem to have the same DNA as the map. Now compare this to the Zodiac "bulls" for example, quite puzzling.

I wonder whether it would make sense to look for parallels for these buildings on things like portolan charts? Those are surely some of the closest things we know to this foldout...