Conceptual art
The 1960s and 1970s saw the introduction of conceptual art, shifting emphasis away from craftsmanship to ideas. This often meant the elimination of objects in art production; only ideas were stated or discussed. It required an enhanced level of participation by the patron (interactive participation or a set of instructions to follow). Conceptual art, Minimalism, Earth art, and Performance art mingled together to expand the very definition of Art.