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Oskar Koller was a German painter and graphic artist.
He studied at the Academy of Fine Arts in Nuremberg and became known primarily for his vivid abstract watercolors of flowers, trees, landscapes, and people.
Gerard Verdijk was a Dutch abstractionist painter who worked in a wide range of materials and techniques.
Curious and eager to learn new things, he traveled to Europe, Turkey, the Middle East, North America, Africa and Japan to experience other cultures.
Verdijk's work cannot be attributed to any one historical and artistic movement. The ever-changing world around him influenced his style and use of materials.
Carl Altena was a German painter. Carl Altena attended the Düsseldorf Art Academy from 1912 and took lessons from Prof. Willy Spatz (1861-1931). In 1914 he was drafted for military service and was taken prisoner in England in 1917. After his release, he settled in Mülheim an der Ruhr in 1919, became self-employed in 1925 and worked as a freelance artist from then on.
Sigmar Polke was a German painter and photographer.
Polke experimented with a wide range of styles, subject matters and materials. In the 1970s, he concentrated on photography, returning to paint in the 1980s, when he produced abstract works created by chance through chemical reactions between paint and other products. In the last 20 years of his life, he produced paintings focused on historical events and perceptions of them.
