In 1916 he returned with his family to Poland, settling in his wife's hometown of Częstochowa. He associated with the Formists. Upon his frequent visits to Warsaw, he collaborated with the future members of ("rhythm"), a group he co-founded in 1921. In 1922 he left Poland for good. First, he went to Germany, where he had already been known and esteemed before the World War I. He visited Berlin and later Bonn, where he carried out a commission to decorate the interior of the villa of the architect Fritz August Breuhaus with paintings. He co-operated with the periodical Deutsche Kunst und Dekoration, publishing articles on certain artists who were close to him. In 1923 he settled once again in Paris, where he joined his friends Zygmunt Menkes and Marc Chagall. His growing artistic fame and financial successes ended suddenly when he died of a heart attack in Paris, aged 41. He did not live to take over the faculty of painting, which had been offered to him by the Academy of Fine Arts, Cologne, Germany.