Found it while perusing the honorarium page.
by Spencer Tunick
We would like to invite you to POSE NUDE in a group photographic installation by artist Spencer Tunick.
Spencer will choose men, women and any gender identity to be part of this unique installation.
In order to be chosen we ask that you please send in a low resolution photograph of yourself.
Participants will be selected based on photographs submitted to the email: projects here: projects (at) spencertunick.com
Please send the image sooner rather than later.
Most installations by Spencer do not have limits to the number of people participating, nor do they require the submission of a photograph. However, for this art work for Burning Man, there is a cap on the number of people participating due to the specific concept of the work.
We are asking for a photograph because we want to have a wide range of body types and skin tonalities represented in the final work. Although everyone is unique, If you are not chosen, it is simply because we may have reached the amount of people with similar specific characteristics. We apologize in advance if you are not chosen for this particular idea but please do not let it deter you from posing in future works by Spencer where there are no number limits.
Chosen participants will be contacted by email prior to August 26th with: the day, time, location and further instructions. Please only sign up if you are committed to participating and able to wake up before sunrise (or stay up all night). The work will take place before sunrise in order to utilize the pre-dawn light. You will be in position when the sun rises.
Range of body types.... Might be nice to see burning man photography that isn't all 20 year old chicks. Though the before dawn cat herding will be tough.
I actually really like his work. I hate my body, but I'm sorely tempted to make a go at this.