(Hans Haacke, Rhinewater Purification Plant, 1972. Glass and acrylic containers, pump, polluted Rhine water, tubing, filters, chemicals, goldfish, drainage to garden. Museum Haus Lange, Krefeld.) (Pruned: April 2011から)
(Hans Haacke, Rhinewater Purification Plant, 1972. Glass and acrylic containers, pump, polluted Rhine water, tubing, filters, chemicals, goldfish, drainage to garden. Museum Haus Lange, Krefeld.)