An art car shaped like a train drives across the desert in the early morning hours at the 2013 Burning Man arts and music festival in the Black Rock desert of Nevada

An art car shaped like a train drives across the desert in the early morning hours at the 2013 Burning Man arts and music festival in the Black Rock desert of Nevada, August 30, 2013. The Burning Man organization received approval from the federal government to have a maximum of 68,000 participants attend the festival. REUTERS/Jim Bourg (UNITED STATES – Tags: SOCIETY) FOR USE WITH BURNING MAN RELATED REPORTING ONLY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO THIRD PARTY SALES. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS ORG XMIT: BRC422