A solitary visitor walks through the colonnaded arcade surrounding the vast open courtyard of Ibn Tulun Mosque (Gami' Ahmad Ibn Tulun) in Cairo, photographed in black and white. The receding row of pointed arches and thick brick piers creates a strong geometric perspective, characteristic of the mosque's Abbasid architectural style dating to 879 AD. Ibn Tulun Mosque is one of the oldest and largest mosques in Egypt, and among the best-preserved examples of early Islamic architecture in the world.