OPUS RETICULATUM

From Hadrian's Villa Tivoli Early 2nd century The Romans discovered concrete and with this material developed entirely new ways of building. Concrete is sturdy, inexpensive, and quick and easy to use. Invariably the concrete is faced. In this example it is faced with opus reticulatum. Stones are pounded into the cement and at the joints they run in diagonal lines forming a diamond-shaped net.

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