Nude volunteers prepare to pose for a photograph by American artist Spencer Tunick, not seen, at sunrise on Ave. Bolivar in downtown Caracas, Venezuela, Sunday, March 19, 2006. Tunick has photographed and filmed masses of people in the nude in dozens of public places from Finland to Australia. [AP Photo]

American artist Spencer Tunick, right on ladder, reaches for a megaphone as he prepares to photograph a mass of nude volunteers at sunrise in downtown Caracas, Venezuela, Sunday, March 19, 2006. Tunick has photographed and filmed masses of people in the nude in dozens of public places from Finland to Australia. [AP Photo]