This untitled "composition" is an excellent example of Sonderborg's Tachist work. Influenced by both the experimental prints being done at Atelier 17 in Paris and his exposure to the "Action Painting" of the New York Abstract Expressionists Sonderborg creates a swirling, gestural image in aquatint. He tempers the calligraphic black with some color, blue and red-orange, which adds an even more explosive element to the composition.
An impression of this aquatint is in the Museum of Modern Art collection and was used in an exhibition in 2006, titled "Eye on Europe" and is illustrated in color on page 16, figure 1.