The Roman arch underwent an important modification in the center Ages from the evolution on the pointed arch, which supplied a solid skeleton resting on perfectly-spaced piers. The huge, rigid masonry constructions from the Romans gave way to soaring vaults supported by exterior flying buttresses (exterior bracing). Glass block or https://objects-us-east-1.dream.io/blissdrive/westhillmasonry/Hardscape-Contractors.html