Out on the playa of Nevada's Black Rock Desert, more than 50,000 participants gathered last week to form Black Rock City, a temporary city that became the home of the 26th annual Burning Man Festival. Every year, participants from around the world descend on the playa -- performers, artists, free spirits, and more -- to form a self-reliant community, to dance, to express themselves and take in the spectacle of the festival. Reuters photographer Jim Urquhart spent the week on the playa, and returned with these photographs, taking us along on a virtual visit to Burning Man 2012.