Opus mixtum

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Opus mixtum (Latin for "mixed work"), also called opus vagecum or opus compositum, was an ancient Roman masonry technique that mixed different brick patterns. It could combine opus reticulatum with areas of opus latericium at the edges, or pair opus vittatum with opus testaceum. This type of masonry was used on wall edges to reinforce them and to manage cracks along diagonal joints. It was commonly used during the Flavian period (about 70 CE) and later under Trajan (98–117 CE) and Hadrian (117–138 CE).