Three-section orbs

[nablator]

In the first example, is Gower's bow drawn on purpose like a rainbow? Otherwise the coloring and shading on this one item would be more awkward than the rest.

Rainbow bow pun?

The evolution of illustrations is interesting. A different tripartite globe in this manuscript (early 15th c.?) with air/earth/water vertically separated:

   
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What is the earliest inverted T-O globe illustration?

This one is dated 14th century:
   
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