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Imi Knoebel (born Klaus Wolf Knoebel) is a German artist. Knoebel is known for his minimalist, abstract painting and sculpture. The "Messerschnitt" or "knife cuts," are a recurring technique he employs, along with his regular use of the primary colors, red, yellow and blue. Knoebel lives and works in Düsseldorf.
Ulrich Erben is a German painter. From 1980 to 2005, he was a Professor of Painting at the Kunstakademie Münster (University of Fine Arts Münster). He is known as a master of the color field style of abstract painting, closely related to abstract expressionism, in which he creates tension between a defined surface structure, his own method of applying paint to a canvas, and the relationship of various shades of white or color to each other in their placement as part of a composition on the flat plane of a canvas. In 1986 and 2008, he was awarded the Konrad-von-Soest Prize for Visual Arts by the Landschaftsverband Westfalen-Lippe (Landscape Society Westphalia-Lippe).