Nude members of the public take part in 'Mardi Gras: The Base', an art installation by artist Spencer Tunick, at the Sydney Opera House on March 1, 2010 in Sydney, Australia. More than 5000 people gathered on a cool, cloudy Sydney morning for Tunick's first Australian installation, which follows visits to the US, Brazil, France, England and Austria. Tunick stated that the title of the work, commissioned by the Sydney Gay and Lesbian Mardi Gras, refers to the sameness of individuals, regardless of their sexual preferences. (Photo by Don Arnold/WireImage)