Robert Rauschenberg was an American artist known for bridging Abstract Expressionism and Pop Art. He developed new techniques using silkscreen printing to incorporate images from books and magazines onto his canvases. His pieces had no single meaning, as the loosely organized images allowed for free association by the viewer. Analysis of his 1970 work "Signs" notes the collage of visual images gives the illusion of many possible meanings, such as an astronaut representing the first moonwalk and a jeep symbolizing the Vietnam War.