“All of a sudden, he created an amazingly large number of works in a completely new style,” Felix Klee said of his father, the artist Paul Klee, in a 1988 interview. “More than 1,200 in the single year of 1939.” The artist died a year later. Klee’s last decade was both turbulent and productive. In 1933, labeled a “Galician Jew,” he was dismissed from his post at the Düsseldorf Academy. He left Germany for Bern, Switzerland, and two years later began to feel the effects of scleroderma, a fatal autoimmune disease that hardens the skin and internal organs. The powerful works in this exhibition at the Jewish Museum are arguably among Klee’s best, and were created in great pain. —Elena Clavarino