’Twas the night before Christmas, when all through the houseNot a creature was stirring, not even a mouse;The stockings were hung by the chimney with care,In hopes that St. Nicholas soon would be there;
The children were nestled all snug in their beds,While visions of sugar-plums danced in their heads;And mamma in her ‘kerchief, and I in my cap,Had just settled down for a long winter’s nap,
When out on the lawn there arose such a clatter,I sprang from the bed to see what was the matter.Away to the window I flew like a flash,Tore open the shutters and threw up
The Romans and Russians did it too but none of those walls worked for anything except keeping men employed long enough to build it. After that it just becomes a tourist trap. A smart entrepreneur would start making the souvenirs soon.
I have to say this. The laws of physics are immutable, not intractable. The laws of physics cannot be changed and they are not hard to manage.