[…] In Algiers one speaks simply of the existence of two varieties of Islam — one, which is called the Islam of the desert, and a second, which is defined as the Islam of the river (or of the sea). The first is the religion practiced by warlike nomadic tribes struggling to survive in one of the world’s most hostile environments, the Sahara. The second Islam is the faith of merchants, itinerant peddlers, people of the road and of the bazaar, for whom openness, compromise, and exchange are not only beneficial to trade, but necessary to life itself.”