09-05-2020, 04:57 PM
A couple of things I should have added above.
- Diaper in the strictest sense is the X shaped decorative motif in all of the examples above, but medievalists also use it to mean “repeated geometric decorative pattern in squares” even if the motif inside the boxes is a different shape.
- A lot of medieval diaper survives in medieval cathedrals (partly because they’re the main type of medieval building to have survived). Westminster Abbey in the UK has loads and they have a blog with some nice photographs including a ceiling that reminds me of the 9-rosette page when I’ve got nothing better to speculate wildly about



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