Any ideas about this detail? (Middle right rosette).

[Koen G]

I have had my own theory of this detail, but it is not at all consistent with your interpretation, so I doubt it will be of much interest to you.

Mark, I am very much interested in any ideas. I think we should try to assess proposals by the arguments in favor and against them. The VM makes this hard by pushing our confirmation bias buttons, but I try my best.

radapox: so cool! But yeah, this looks like a very specific and rare phenomenon.