No text, but a visual code

[R. Sale]

Those are the same concerns that I was suggesting. Do the spiral patterns in the RC indicate axial rotation? Or is the suggestion of axial rotation a concept that is anachronistic to that time? I may be mistaken, but it would seem to be a modern interpretation imposed where it did not exist. But if that is true, then what is the explanation for the spirals?

Difficulty can be in the 'eye' of the beholder, so to speak. Medieval thought can be non-scientific, irrational and superstitious, not to mention potential inconsistencies between different historical sources. Something as simple as a nebuly line cannot be properly interpreted, if it cannot be recognized and named.