A pioneer in the Minimal and Conceptual movements of the 1960s, LeWitt has influenced the community of artists, designers, writers, and musicologists with his work as well as with his thinking. Since the early 1960s, when LeWitt's paint ings in the Constructivist style were transformed into reliefs and he began to construct with modules, he has used the square and the cube as his basic units; the simplest of geometric forms, they have pro vided the primary ingredients for his work in both two and three dimensions. Like his structures, hisdrawings are composed according to a simple rule and use basic elements: four basic kinds of straight lines — horizontal, vertical, and the two diagonals. In his color work he again returns to basics, using the three primary colors plus black.