Indiana's work has been inspired by old trade names, traffic signs, automatic amusement machines and commercial stencils. He has created poems, paintings, sculptures, silk screens and posters. Pieces by Indiana stem from not only symmetry, color and form, but also content that addresses politics, religion and the human condition.
The art of Robert Indiana has been exhibited at The Guggenheim Museum, New York, The Institute of Contemporary Art, Boston, The Institute of Contemporary Art, Philadelphia, The Museum of Modern Art, New York, The National Museum of American Art, Smithsonian Institute, Washington, DC, The Whitney Museum of American Art, New York, and numerous other museums and galleries across the world. In 1970 he received an Honorary Doctor of Fine Arts from Franklin and Marshall College, Lancaster, Pennsylvania, as well as one in 1977 from the University of Indiana and another in 1981 from Colby College. A collective retrospective of his work was shown at the Musée D'Art Moderne Contemporain, Nice, France, in 1998 and more have followed. Indiana is a celebrated artist whose realist approach, (as coined by the Sidney Janis Gallery, New York), helped define a generation of art and artists.