In the courtyard of the palace museum art form up in Dusseldorf on 06/08/2006 around 850 volunteers in a pyramid to be photographed by the American installation artist Spencer Tunick. With its instalation Tunick himself refers to the Düsseldorf Quadrienale06 – the first year of art, that will now be held every four years. Since 1992, the artist photographed nude in public space.