The bulk of materials used in buildings of the 4th to 6th cents.
In the east, vaults and domes came to be built in brick; whereas in the west more traditional concrete was still used, sometimes lightened with interlocking hollow tubes of terracotta. In many parts of the empire *mosaics were common, both in rich private houses and in the new churches. For floors, mosaicists generally used stone cubes for their durability, while on walls they attained a richer sparkling effect through the use of gilt and coloured glass cubes.Less
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