Question: What roman author described the technique of Opus quadratum?
Context: The Roman arch of Medinaceli (Spanish: "Arco Romano de Medinaceli") is a Roman Triumphal arch located in Medinaceli, in Castile and León, Spain.  It is constructed in stone using a technique called "Opus quadratum". Justo Gonzalo Rodríguez-Leal (March 2, 1910 – September 28, 1986) was a Spanish neuroscientist, who described and interpreted what he called "central syndrome of the cortex" which is a multisensory disorder with bilateral symmetry, due to a unilateral parieto-occipital cortical lesion.  In relation to this syndrome, the author described, among other disorders, the inverted perception disorder (visual, tactile and auditive) and the and motor facilitation.  This phenomenon consists on the improvement of the perception of a given stimulus by the presence of another different stimulus of the same or another sensory system (), and particularly by means of muscular activity or effort.  He interpreted this syndrome by developing a model of brain dynamics based on neurophysiological studies of brain injury cases and biological principles of growth.The model emphasizes the functional unity of the cortex and offers a dynamic solution for the functional specializations of the brain by means of functional gradients through the cortex, and scaling laws.  He received awards from the Spanish National Research Council (Consejo Superior de Investigaciones Científicas) (1941), the (Real Academia de Medicina) (1950), and the (Sociedad Española de Psicología) (1958). The tendons of certain animals (particularly beef tendon) are used as an ingredient in some Asian cuisines, including the Chinese, Japanese, Korean, Indonesian, Thai and Vietnamese traditions.  Tendon is tough and fibrous, but becomes soft after a long period of cooking.  In some cases it may be boiled for as long as eight hours, while in other dishes it is prepared by deep frying.  It contain large amounts of collagen, and after boiling or stewing, it is sometimes described as mimicking the mouthfeel of high-fat cuts of beef despite its low fat content.  One author described the taste of deep-fried tendon as being similar to "chicharrón" (fried pork belly). 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 craticum or "craticii" is an ancient Roman construction technique described by Vitruvius in his books "De architectura" as wattlework which is plastered over.  Vitruvius disparaged this building technique as a grave fire risk, likely to have cracked plaster, and not durable.  Surviving examples were found in the archaeological excavations at Pompeii and more so at Herculaneum, buried by the eruption of Mt. Vesuvius in 79 AD and excavated beginning in 1929.  Scholarly confusion exists and the term "opus craticium" is also used for the Roman building technique very similar, but not identified as being directly related to half-timbering, a timber framework with the wall infill of stones in mortar called "opus incertum".  An example of this technique is the House of Opus Craticum in Herculaneum, which is a reconstruction of the original building. Sacrament is a 1996 novel by British author Clive Barker.  The protagonist is a wildlife photographer obsessed with documenting species of animals that are faced with extinction.  It is set in Yorkshire, England, San Francisco and Hudson Bay, Canada and explores how his obsession is connected to his upbringing in Yorkshire.  The Author described it as "a story about how we become who we are and how we must deal with what we are by facing up to including the things that happened to us in childhood, good and bad.  It's also about what's happening to our planet." Opus tessellatum is the Latin name for the normal technique of Greek and Roman mosaic, made from tesserae that are larger than about 4 mm.  It is distinguished from the finer "opus vermiculatum" which used tiny "tesserae", typically cubes of 4 millimetres or less, and was produced in workshops in relatively small panels which were transported to the site glued to some temporary support.  "Opus tessellatum" was used for larger areas and laid down at the final site.  The two techniques were often combined, with small panels of "opus vermiculatum" called "emblemata" at the centre of a larger design in "opus tessellatum".  The tiny "tesserae" of "opus vermiculatum" allowed very fine detail, and an approach to the illusionism of painting.  There was a distinct native Italian style of "opus tessellatum" using only black on a white background, which was no doubt cheaper than fully coloured work. In architecture, the latin term opus ("work) is a word that generically indicates various techniques of constructing buildings that were in use in ancient Rome.  Usually the word "opus" is not used alone in building descriptions, but is paired with specific attributes ("incertum", "latericium", etc.), whose purpose is to show precisely the building technique that was used (i.e. "opus incertum", "opus latericium", "opus reticulatum", "opus mixtum", etcetera). 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. Opus mixtum (Latin: "mixed work"), or Opus vagecum and Opus compositum, was an ancient Roman construction technique.  It can consist in a mix of "opus reticulatum" and at the angles and the sides of "opus latericium".
Answer: Vitruvius