The Centre Pompidou in Metz invited Giuseppe Penone for its tenth birthday in 2020. The Italian artist attaches great importance to the forest, the river, the mountain, and the body. In the 1960's he was part of the Arte Povera movement, whose members worked from pure energies, everyday experiences, and raw materials. Penone installed a bronze cast of a walnut tree about 49 ft high (15 m) in the forum of the Centre Pompidou. Some of its parts are also made of white marble. The work, entitled Indistinti confini - Noce (Indistinct border - Walnut), consists of a tree that is both metallic and mineral, immaculate and altered.