India, May 3 -- In the aperitif hour in Tangier, visitors gather on the rooftops of hotels in the medina to watch the sun set over the Strait of Gibraltar. Turtle doves swoop and swerve in the lilac dusk. The lights of the port come up and reflect on the bay, where a grand old sailboat is putting to sea. To the east, the hunched backs of the Rock of Gibraltar and Jebel Musa, the Pillars of Hercules, loom in the distance, purple in the falling light.

Just after 6 pm, a hollow crackling comes over a loudspeaker, followed by a hoarse chanting, which is joined by another voice, and then another. A song in the round from several sources, at various decibel levels: the Maghrib adhan, or the evening call to prayer.

Here's why Yves Saint Lauren...