Four color drawing with each color in a half square

Sol LeWitt (1928-2007) Four color drawing with each color in a half square signed, titled and dated 'Four color drawing with each color in a half square Sol LeWitt May 13, 1971' (lower edge) ink and graphite on paper 10 x 10 in. (25.4 x 25.4 cm.) Executed in 1971.