View of Algiers bei Flickr via Getty

"There are two cities within Algiers, the French and the Arab. Between the two, so distinct from each other, there are no barriers save those that exist between races, living on defiance and antipathy; that is enough to separate them. In the lower city, the Algerian people are among us; in the upper, we are among them."

Eugène Fromentin, Une année dans le Sahel (Paris, 1874)