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

@Marshalist geometria grawitacji się nie boi
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