Opus reticulatum is a construction technique using small pyramid shaped blocks of tufa set in a core of opus caementicium. The tufa blocks cover the surface, with the pointed end into the cement, so the square bases form a diagonal pattern that resembles a net, hence the name.
This technique was used from the beginning of the first century BCE and is very common until the early imperial period when opus latericium, brickwork, becomes more common.
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