input: In 1919, Klee applied for a teaching post at the Academy of Art in Stuttgart. This attempt failed but he had a major success in securing a three-year contract (with a minimum annual income) with dealer Hans Goltz, whose influential gallery gave Klee major exposure, and some commercial success. A retrospective of over 300 works in 1920 was also notable. Klee taught at the Bauhaus from January 1921 to April 1931. He was a "Form" master in the bookbinding, stained glass, and mural painting workshops and was provided with two studios. In 1922, Kandinsky joined the staff and resumed his friendship with Klee. Later that year the first Bauhaus exhibition and festival was held, for which Klee created several of the advertising materials. Klee welcomed that there were many conflicting theories and opinions within the Bauhaus: "I also approve of these forces competing one with the other if the result is achievement." Klee was also a member of Die Blaue Vier (The Blue Four), with Kandinsky, Lyonel Feininger, and Alexej von Jawlensky; formed in 1923, they lectured and exhibited together in the USA in 1925. That same year, Klee had his first exhibits in Paris, and he became a hit with the French Surrealists. Klee visited Egypt in 1928, which impressed him less than Tunisia. In 1929, the first major monograph on Klee's work was published, written by Will Grohmann. Klee also taught at the Dusseldorf Academy from 1931 to 1933, and was singled out by a Nazi newspaper, "Then that great fellow Klee comes onto the scene, already famed as a Bauhaus teacher in Dessau. He tells everyone he's a thoroughbred Arab, but he's a typical Galician Jew." His home was searched by the Gestapo and he was fired from his job. His self-portrait Struck from the List (1933) commemorates the sad occasion. In 1933-4, Klee had shows in London and Paris, and finally met Pablo Picasso, whom he greatly admired. The Klee family emigrated to Switzerland in late 1933. Klee was at the peak of his creative output. His Ad Parnassum (1932) is considered his masterpiece and the best example of his pointillist style; it is also one of his largest, most finely worked paintings. He produced nearly 500 works in 1933 during his last year in Germany. However, in 1933, Klee began experiencing the symptoms of what was diagnosed as scleroderma after his death. The progression of his fatal disease, which made swallowing very difficult, can be followed through the art he created in his last years. His output in 1936 was only 25 pictures. In the later 1930s, his health recovered somewhat and he was encouraged by a visit from Kandinsky and Picasso. Klee's simpler and larger designs enabled him to keep up his output in his final years, and in 1939 he created over 1,200 works, a career high for one year. He used heavier lines and mainly geometric forms with fewer but larger blocks of color. His varied color palettes, some with bright colors and others sober, perhaps reflected his alternating moods of optimism and pessimism. Back in Germany in 1937, seventeen of Klee's pictures were included in an exhibition of "Degenerate art" and 102 of his works in public collections were seized by the Nazis.

Answer this question "What are some other works from his mature period?"
output:

input: Ali said that he first heard of the Nation of Islam when he was fighting in the Golden Gloves tournament in Chicago in 1959, and attended his first Nation of Islam meeting in 1961. He continued to attend meetings, although keeping his involvement hidden from the public. In 1962, Clay met Malcolm X, who soon became his spiritual and political mentor. By the time of the first Liston fight, Nation of Islam members, including Malcolm X, were visible in his entourage. This led to a story in The Miami Herald just before the fight disclosing that Clay had joined the Nation of Islam, which nearly caused the bout to be canceled. In fact, Clay was initially refused entry to the Nation of Islam (often called the Black Muslims at the time) due to his boxing career. However, after he won the championship from Liston in 1964, the Nation of Islam was more receptive and agreed to publicize his membership. Shortly afterwards on March 6, Elijah Muhammad gave a radio address that Clay would be renamed Muhammad (one who is worthy of praise) Ali (most high). Around that time Ali moved to the south side of Chicago and lived in a series of houses, always near the Nation of Islam's Mosque Maryam or Elijah Muhammad's residence. He stayed in Chicago for about 12 years. Only a few journalists (most notably Howard Cosell) accepted the new name at that time. Ali later announced: "Cassius Clay is my slave name." Not afraid to antagonize the white establishment, Ali stated, "I am America. I am the part you won't recognize. But get used to me. Black, confident, cocky; my name, not yours; my religion, not yours; my goals, my own; get used to me." Ali's friendship with Malcolm X ended as Malcolm split with the Nation of Islam a couple of weeks after Ali joined, and Ali remained with the Nation of Islam. Ali later said that turning his back on Malcolm was one of the mistakes he regretted most in his life. Aligning himself with the Nation of Islam, its leader Elijah Muhammad, and a narrative that labeled the white race as the perpetrator of genocide against African Americans made Ali a target of public condemnation. The Nation of Islam was widely viewed by whites and some African Americans as a black separatist "hate religion" with a propensity toward violence; Ali had few qualms about using his influential voice to speak Nation of Islam doctrine. In a press conference articulating his opposition to the Vietnam War, Ali stated, "My enemy is the white people, not Viet Cong or Chinese or Japanese." In relation to integration, he said: "We who follow the teachings of Elijah Muhammad don't want to be forced to integrate. Integration is wrong. We don't want to live with the white man; that's all". Writer Jerry Izenberg once noted that, "the Nation became Ali's family and Elijah Muhammad became his father. But there is an irony to the fact that while the Nation branded white people as devils, Ali had more white colleagues than most African American people did at that time in America, and continued to have them throughout his career."

Answer this question "Why did he hide his involvement?"
output:
In fact, Clay was initially refused entry to the Nation of Islam (often called the Black Muslims at the time) due to his boxing career.