4. Arch and Vault system is unique in the construction of important Roman building see no solid help tons. Stunning savings Avail in many areas as this system use antenna system beams placed across the Poles less loud, aka the placenta, and can also create nested Greek layers such as aqueduct or the Colosseum. When multiple shared Vault can do is Cross Groined Barrel Vault and Vault or Cross Vault roof makes a dome which causes extensive internal space. Invented cement-concrete, it has important architectural growth.
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