The Great Hub is the most unique building on the Moon, its architectural style alone doesn't seem like a product of this era—because it is a giant five-pointed star-shaped bastion.
Theoretically speaking, an architectural style like the "bastion" should have been abandoned five hundred years ago. This concave polygonal giant fortress originally relied on crossfire to defend itself at the very dawn of the firearms era. But with the advent of explosive shells, the extension of artillery range, and the increase in outdoor mobility warfare, this kind of fortification had basically exited the historical stage by the 19th century.
If the world were normal, no one in the interstellar exploration age would remember such an ancient architectural form.
But this is the Moon.
Several walls of varying heights rose directly out of the lunar dust, and the center part of the five-pointed star is the castle "Virtue Castle" of King Aqini.
