ABSTRACT
The ksur (sing. ksar) shows a very dense urban fabric, with houses (dâr) built each against other in order to defend each other from the warmth; in addition, often the first floor is built as a bridge over the road, thus creating, below, a fresh and dark grid of tunnels that protect from heat and sand storms. It is interesting to see how this type of aggregation simulate the underground architectures, enjoying the advantage of thermal insulation and, at the same time, solving the big problem of ventilation (Bourgeois 1988, p. 1).
