("Marble Skin on Acacia Thorns"), exhibited in 2001 at the Musée d'Orsay of Paris and the Fujikawa Gallery in Osaka. In Pelle di cedro ("Cedar Skin") of 2002 exhibited for the first time in the anthological exhibition of Penone's work by the Centre Georges Pompidou in Paris in 2004, an imprint of the bark of a tree is impressed on the cowhides tanned using traditional methods. The roughness of the bark transferred to the hides and displayed in negative resembles a pattern of veins, as in the Anatomie. Bark also underlies the casts that appear in Lo spazio della scultura ("The Space of Sculpture") an installation presented at the recent exposition at the Studio per l'Arte Contemporanea Tucci Russo at Torre Pellice and the Museum Kurhaus Kleve between 2006 and 2007. "The structure of fluids is the same whatever the element. A watercourse, a growing tree and a pathway have similar forms" writes Penone of the work titled Albero giardino ("Tree Garden"), produced for a former railroad site in Turin in 2002. In this outdoor work, the human action, hence culture, is compared to the force of natural elements and expressed in the design of a path traced by the vegetation, whose outline represents the growth of a tree. Between 2003 and 2007, Penone was involved in the production of a large scale installation of sculptures for the seventeenth-century Palazzo di Venaria in Piedmont. This work, titled "The Garden of Fluid Sculptures," includes fourteen sculptures made in bronze, wood, and marble and spread over several acres of the outdoor gardens. In 2007 Penone was also invited to the Venice Biennale where he set up an installation for the new opening of the Padiglione Italiano. In 2011 Penone participated in the Art Gallery of Ontario "Galleria Italia," which included his work Repeating the Forest (2007–2008). With this work Penone had carefully removed rings of growth from a fir tree to reveal its former young shape hidden beneath decades of growth, and Versailles Cedar, 2000-2003. "Penone arrives at these forms by carving the tree trunk leaving the knots in place until they emerge as limbs, revealing the sapling within." Regarding this work, he stated "My artwork shows, with the language of sculpture, the essence of matter and tries to reveal with the work, the hidden life within." Penone in Arte Povera Since 1969 Penone has been one of the leading representatives of