"Himmelstreppe" by Hermann Prigann
Halde Beckstraße in Bottrop with the "Tetraeder" by Wolfgang Christ
Halde Rheinelbe in Gelsenkirchen with the "Himmelstreppe" by Hermann Prigann
"Tiger & Turtle" by Heike Mutter & Ulrich Genth
Halde Haniel with "Totems" by Agustin Ibarrola
