800 men and women in Belgium shed their clothes to fight with pillows at Gaasbeek Castle, 6 miles south of the capital Brussels. The volunteers posed for the latest nude photo installation by daring U.S. artist Spencer Tunick. The piece, entitled "Sleeping Beauties" was shot entirely on the grounds of the castle and is the latest in Tunick's expansive portfolio.

Tunick, who specializes in nude outdoor photography, is known for gathering large crowds of naked models in public spaces. His largest project had 18,000 people posing in Mexico City's main square, Zocalo.

Here's a look at "Sleeping Beauties"