http://galleries.burningman.org/filestore/4/5/8/7/5_992a6ffb61bbc30/45875pre_78e42506f757363.jpg?v=2013-08-23+23%3A07%3A46
Dust devil
http://galleries.burningman.org/filestore/4/5/8/7/5_992a6ffb61bbc30/45875pre_78e42506f757363.jpg?v=2013-08-23+23%3A07%3A46
Dust devil