“Unless you're involved with thinking about what you're doing, you end up doing the same thing over and over, and that becomes tedious and, in the end, defeating.”

“The other great development has been in photography, but that too was influenced by Conceptual art.”

“Just as the development of earth art and installation art stemmed from the idea of taking art out of the galleries, the basis of my involvement with public art is a continuation of wall drawings.”

“Conceptual art became the liberating idea that gave the art of the next 40 years its real impetus.”