Torsten Warmuth sets out in search of the unmistakable face of the world's metropolises. Previously, this was in Buenos Aires, Lisbon, Paris or New York, and now in Africa's biggest city: Cairo. It is urban life beyond the tourist destinations that shapes the face of a city. In Cairo, a metropolis of twenty million, Torsten Warmuth found this in the bazaars of Khan-el-Khalilil, the traffic-filled street of Talaat Harb in the traditional commerci