This photo was taken at sunset in the Western Sahara. Our group was traveling through the dunes on our way back to the camp in the Erg Chebbi region of Morocco. The camel caravan was about 40 animals long. I was riding among the first in the train and looked behind me. The length of the train was cresting the top of a dune, framed by the sun, and just as I took the picture, one of the riders waved.