"Al Held (October 12, 1928 – July 27, 2005) was an American Abstract expressionist painter. He was particularly well known for his large scale Hard-edge paintings. ...
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As an artist, multiple stylistic changes occurred throughout his career, however, none of these occurred at the same time as any popular emerging style or acted against a particular art form. In the 1950s his style reflected the abstract expressionist tone and then transitioned to a geometric style in the 60s. During the 1980s there was a shift into painting that emphasized bright geometric space that´s deepness reflected infinity. From 1963 to 1980 he was a professor of art at Yale University." - (en.wikipedia.org 30.01.2020)