JuliansRum has an interesting thread on the Keystone:
7/ Heres how Greek Historian Herodotus described the top of the tower of Babel (Etemenanki):
On the topmost tower there is a spacious temple, and inside the temple stands a couch of unusual size, richly adorned, with a golden table by its side.
........
Picture Epsteins little island temple...
........
8/ There is no statue of any kind set up in the place, nor is the chamber occupied of nights by any one but a single native woman, who, as the Chaldeans, the priests of this god, affirm, is chosen for himself by the deity out of all the women of the land.
9/ One Babylonian text excerpt says:
When the temple was completed [...] on the day of bringing in the keybrick [...] Dingirmañ, my lady, into the temple.
The goddess Dingirmans other name is Ninhursag or The Lady of the Mountain
https://twitter.com/juliansrum/status/1206798489226743808
heavy.
interesting to see the keystone on the SES logos