Martha Dix. Otto Dix met Martha Koch, the wife of doctor and art collector Hans Koch. Dix and Martha later married in 1923. In 1925, Dix and his wife Martha relocated to Berlin. It was here that he created his iconic portraits. Dix’s art from this period can appear shocking with its hyper-realistic style and sometimes unfavorable depictions of his sitters. The distortions often verge on caricature. His aim was to convey the inner character of the sitter.