Nearly 600 men and women volunteers have stripped naked to pose for US photographer Spencer Tunick on the slope of a melting Swiss glacier.
The photo shoot on the Aletsch glacier was commissioned by environmental group Greenpeace as part of a campaign to raise awareness about global warming.
Despite the Alpine setting 2,300m (7545 feet) up, the temperature was well above freezing, at between 10 and 15C.
Tunick specialises in such scenes, which he calls "body landscapes".
His previous backdrops have ranged from Caracas to New York.
The Aletsch glacier is a protected Unesco World Heritage site.