What roman author described the technique of Opus quadratum?
Opus quadratum Opus quadratum is an ancient Roman construction technique, in which squared blocks of stone of the same height were set in parallel courses, most often without the use of mortar. The Latin author Vitruvius describes the technique.
Quintus Sextius Quintus Sextius the Elder ( ; Latin: "Quinti Sextii Patris" ; fl. c. 50 BC) was a Roman philosopher, whose philosophy combined Pythagoreanism with Stoicism. His praises were frequently celebrated by Seneca.