Pistoletto developed a stronger interest in the conceptual aspects of art objects. This included his use of humble materials such as tissue paper and mirrors, which helped lay foundations for the Arte Povera movement. Influenced by the social implications of more experimental tendencies in theatrical performance of his time, he promoted a greater role for art in society and politics through his later projects. Pistoletto's introduction of unusual materials as components in his sculptures, installations and paintings is meant to excite active participation by viewers not only with art but with one another and the world around them by bringing art into life, and life into art.