"In Ulm we practiced Paul Klee's technique of different intensities in layers. For example, if you want to create a hexagon, you can use consecutive triangles to form the surface. I look for variations through the use of color, using lighter tones and darker ones."

Triple superposition of adjacent complementary colors, Cornelia Koch 14.03.1956, Preliminary Course Helene Nonné-Schmidt, hfg ulm

Watercolor on paper, 601 x 412 mm, 1956