In the 1960s, many artists experimented with art that emphasized ideas over objects and materials traditionally associated with art making. In 1967, Sol LeWitt wrote in his essay “Paragraphs on Conceptual Art” that “the idea itself, even if it is not made visual, is as much of a work of art as any finished product.” Conceptual artists used their work to question the notion of what art is, and to critique the underlying ideological structures of artistic production, distribution, and display.