What roman author described the technique of Opus quadratum?
Vitruvius Marcus Vitruvius Pollio (born c. 80–70 BC, died after c. 15 BC), commonly known as Vitruvius, was a Roman author, architect, civil engineer and military engineer during the 1st century BC, known for his multi-volume work entitled "De architectura". His discussion of perfect proportion in architecture and the human body, led to the famous Renaissance drawing by Da Vinci of "Vitruvian Man".
Opus interrasile Opus interrasile, "lit". 'work shaved or scraped in-between' is a pierced openwork metalworking technique found from the 3rd century AD, and remaining popular in Byzantine jewellery. It was developed and popularized in Rome, where metalworkers used it to make arabesques and other similar designs. The technique involves punching holes in metal to simulate lattice patterns, openwork gold jewelry, and so on. Patterns were often drawn on the metal, and then various tools used to remove the desired pieces.