In 1950, Richard Pousette-Dart, along with fellow members of the New York School—they were called the “Irascibles”—signed an open later to the president of the Metropolitan Museum of Art. They were protesting the museum’s conservative approach toward the acquisition and display of American painting. Pousette-Dart’s own painting was radical—a meeting of ideographic symbols and energized abstraction. Today, the American artist is recognized as a first-generation Abstract Expressionist, a visionary, and an innovator. In this show, 16 paintings from the late 1960s to 1992, the year of Pousette-Dart’s death, are on display. —E.C.