PowerPoint Show by Andrew

For 20 years now, New York-based photographer Spencer Tunick has been creating human art installations all over the world, calling together volunteers by the hundreds or thousands, asking them to remove their clothes, and photographing them in massive groups.

He aims to create an architecture of flesh, where the masses of human bodies blend with the landscape, or with architecture.

Naked volunteers pose for Spencer Tunick on the largest glacier in the Alps, Aletsch glacier, in Switzerland.

Naked volunteers stand looking toward Aletsch glacier.

Spencer Tunick directs several hundred naked volunteers covered in body paint on the stairs in front of the opera on Max-Joseph-Platz in Munich.

Some of the hundreds of naked volunteers covered in body paint have touch-ups applied.

Naked volunteers, numbering around 1700 people, pose in downtown Munich.

Volunteers stand up after being photographed by Spencer Tunick in Max-Joseph-Platz in Munich.

Thousands of naked people posed at Vienna's Ernst-Happel stadium during a massive photo session.

Thousands of people pose in the nude for an installation by Spencer Tunick in Zocalo Square in Mexico City.

Thousands of naked volunteers pose in Mexico City's Zocalo square.

Some of the thousands of volunteers standing naked, embracing in Mexico City's main Zocalo plaza.

Thousands of naked women celebrate in Mexico City's Zocalo plaza at the end of the photo session.

Four-hundred and fifty unclothed women are arrayed on the floor around the information booth in New York's Grand Central Terminal.

Naked volunteers stand on escalators during an installation at Selfridge's department store in London.

Naked volunteers pose in the Europarking building in Amsterdam.

Naked volunteers pose in the Europarking building in Amsterdam.

Naked women on bicycles pose on a bridge in Amsterdam.

Nude models hold bottles in a Bourgogne vineyard in France.

Participants pose naked inside the Stadschouwburg theatre in Belgium.

Hundreds of naked volunteers pose for an installation at the Ehrenhof museum complex in Duesseldorf, Germany.

Naked volunteers pose in front of the Sydney Opera House.

U.S. artist Spencer Tunick photographs naked volunteers in front of the Sydney Opera House.

Naked volunteers lie in front of the Sydney Opera House.

Naked volunteers embrace after the photo shoot.