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

Sleeping Beauties
Naked volunteers battle with pillows as they pose for U.S. artist Spencer Tunick in front of the Gaasbeek's Castle, July 9, 2011. Organisers estimated 800 people posed for the early morning nude photo installation titled "Sleeping Beauties". REUTERS
Sleeping Beauties 2
Naked volunteers pose for U.S. artist Spencer Tunick in front of the Gaasbeek's Castle, July 9, 2011. REUTERS
Sleeping Beauties 3
Naked volunteers pose for U.S. artist Spencer Tunick in front of the Gaasbeek's Castle, July 9, 2011. REUTERS
Sleeping Beauties 4
Naked volunteers walk as they pose for U.S. artist Spencer Tunick in front of the Gaasbeek's Castle, July 9, 2011. REUTERS
Sleeping Beauties 5
Naked volunteers pose for U.S. artist Spencer Tunick in front of the Gaasbeek's Castle, July 9, 2011. REUTERS
Sleeping Beauties 6
Naked volunteers pose for U.S. artist Spencer Tunick in front of the Gaasbeek's Castle, July 9, 2011. REUTERS
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