Playa Moon, a 65' spherical projection screen.
People gathered inside the large inflatable white sphere. It was located around 7:00 and L, at the edge of the city. People had to crawl through a small hole to get in and out, since it was a pressurized space.
The acoustics inside this large inflatable ball was interesting, like in a big echo chamber, and the air pressure was slightly higher than normal, which changed the pitch of sounds.
For more info, go to the Playa Moon indiegogo page.
Photo taken at the Burning Man 2015 festival (Black Rock Desert, Nevada).