Three-section orbs

[Diane]

It's very nice to see this subject re-visited. 

I won't pretend not to have seen, and even used, most of these illustrations before, but I don't remember the material being greeted with so much enthusiasm last time round and perhaps this will see your effort, JKP, alluded to and correctly attributed across more sites.

I hadn't noticed Marco's example when writing the subject up, it might be worthwhile (if anyone has the time) to cross-check it against other works from the period made in glass and stone.  

Thanks again.