as well as using discarded materials like crushed or flattened cardboard boxes. Yves Klein incorporated live nude models and a symphony orchestra in his performance pieces of his paintings. John Chamberlain used crushed auto parts for sculpture. In the 1960s Pop artists Andy Warhol, Claes Oldenburg, Tom Wesselmann and Roy Lichtenstein made art from commercial products, or art that resembled commercial products like television sets, soup cans, brillo boxes, comic books, household furniture and restaurant items among other things. Edward Kienholz made replicas of actual environments both domestic and commercial, while George Segal made life-size plaster figures in settings using real objects and props. Dan Flavin used electric fluorescent lights and ballasts to create sculpture. In the 1970s Frank Stella introduced honeycombed aluminum and glitter. In the 1980s Julian Schnabel made "plate paintings" with broken crockery stuck to the surface and then painted over, Anselm Kiefer and Richard Long used mud, soil or tar in their works. In the 1960s and again in the 1990s artists used excrement notably - the Italian artist Piero Manzoni in 1961 and the British artist Chris Ofili who specialized in using elephant dung in the 1990s. Tracey Emin included her bed, entitled My Bed, in 1999.