[@Marshalist](/uzytkownik/Marshalist)﻿ geometria grawitacji się nie boi

@Marshalist﻿ geometria grawitacji się nie boi

_Flat arches with 'hanging' masonry supporting the arena floor of the Colosseum: precise Roman construction using no mortar. Laid upon a frame that was then removed, the central keystone has held the bricks in place since the 1st century CE_

Flat arches with 'hanging' masonry supporting the arena floor of the Colosseum: precise Roman construction using no mortar. Laid upon a frame that was then removed, the central keystone has held the bricks in place since the 1st century CE