Samuel Lewis Francis was an American painter and printmaker. Francis' works of the early 1970s have been referred to as Fresh Air pictures. Created by adding pools, drips and splatters of color to wet bands of paint applied with a roller, these works re-asserted the artist's interest in color. By 1973–4 many of Francis' paintings featured a formal grid or matrix made up of crossing tracks of color. Many of these matrix works were large in scale, measuring up to twenty feet long.