LeWitt wrote Paragraphs on Conceptual Art in 1967 and the text is seen as the manifesto of Conceptualism. Although he drew the ire of more traditional art critics, LeWitt was indubitably one of the most influential artists of the late twentieth century. An overview of his mural art opened at MASS MoCA (Massachusetts Museum of Contemporary Art) in 2008 and will remain on view for twenty-five years.