In autumn 1999, the artist Otto Piene, co-founder of the ZERO group, presented his idea of a mining lamp memorial called Geleucht for the first time. Between 2005 and 2006, 35 lamp poles were assembled on the spoil tip for red illumination of an area of 8,000 square centimetres (1,200 sq in). In 2007, the circa 28-metre high (92 ft) and 115-tonne (113-long-ton; 127-short-ton) heavy landmark was constructed on the Halde Rheinpreußen. (wikipedia)
