Since the 1990s, Imi Knoebel has been working intensively with aluminum as an image carrier. He uses aluminum plates and profiles as autonomous painting surfaces layering them on top of each other to create relief-like works. The layering of individual elements has been one of Knoebel’s main techniques since the 1980s. Works such as Venera (1996) and 16 Farben auf Blanc de titane (1993) consist of colored aluminum strips arranged in a strict geometric pattern. By using the primary colors red, yellow and blue, Venera refers to Knoebel's engagement with painters such as Piet Mondrian and Barnett Newman.
The same group of works also includes: Lentoi (2004).