Why the rosettes image may not be a map at all

[MarcoP]

What I find particularly interesting about the VMS rosettes page is the vantage point from which the details have been drawn. Most medieval maps with buildings were straight on (even if the map was at an angle) or "flattened" in odd ways but the VMS "map" makes you feel like whoever drew it flew over in a hot-air balloon—in other words, drawing many of the buildings from an angle that would have been impossible to see in real life in the 15th century unless one were at a great height.

Hi JKP, while I agree with your description of typical medieval maps, in the XV Century things were beginning to change, with a more robust approach to perspective and the representation of three-dimensional shapes.
See for instance You are not allowed to view links. Register or Login to view. (England, 1st quarter of the 15th century) or Walsperger's world map (You are not allowed to view links. Register or Login to view. B, 1448).