The use of red wax is also part of his repertoire, evocative of flesh, blood, and transfiguration. In 2007, he showed "Svayambh" (which translated from Sanskrit means "self-generated"), a 1.5-metre block of red wax that moved on rails through the Nantes Musée des Beaux-Arts as part of the Biennale estuaire; this piece was shown again in a major show at the Haus der Kunst in Munich and in 2009 at the Royal Academy in London. Some of Kapoor's work blurs the boundaries between architecture and art. In 2008, Kapoor created "Memory" in Berlin and New York for the Guggenheim Foundation, his first piece in Cor-Ten, which is formulated to produce a protective coating of rust. Weighing 24 tons and made up of 156 parts, it calls to mind Richard Serra's huge, rusty steel works, which also invite viewers into perceptually confounding interiors.