Year: 1968
Medium: Painted Steel
Year: 1969
Medium: Painted Aluminium
Year: 1972
Medium: Aluminium
Year: 1977
Medium: Steel
Year: 1980
Medium: Stainless Steel
Year: 1984
Year: 1992
Medium: Aluminum and Granite
Medium: Stainless Steel and Granite
Year: 1993
Medium: Aluminium and Granite
Year: 2000
Medium: Granite, Bronze, and Glass
Year: 2003
Medium: Aluminium and Stainless Steel