Oil pastel, 41,5 x 60 cm, lo. ri. monogr. CA, on the backing cardboard dat. a. inscribed '1960 - Nr. 50', matted a. framed under glass. - German painter, draughtsman a. graphic artist, one of the most important exponents of abstract painting in Germany. C. was trained as photographer before studying at the Städelschule in Frankfurt 1924-26. As early as 1933 he was discriminated by the Nazis. He continued to work in secrecy in Garmisch but was denounced a. arrested in the KZ Dachau for several months. In 1949 he was among the co-founders of the artist's group ZEN 49. He taught repeatedly in Hamburg. In 1978 his livetime achievement was awarded with the Lovis Corinth prize.