It comes as a surprise that “Keith Sonnier: Until Today,” a selection of thirty-nine works made between 1967 and this year, really is “the first comprehensive museum survey to consider the arc of this iconic artist’s achievement,” as curator Jeffrey Grove writes in the catalogue. After all, Sonnier has been a renowned figure for five decades; by thirty he’d exhibited at the Stedelijk Van Abbemuseum in Eindhoven, the Netherlands, and at the Museum of Modern Art in New York. He also participated in legendary shows such as Lucy Lippard’s “Eccentric Abstraction” at New York’s Fischbach Gallery in