This reflects the period's so-called "dematerialization of the art object," and the flight from traditional media. It also reflects the political ferment of the time: the rise of feminism, which encouraged thought about the division between the personal and political and anti-war activism, which supplied models for politicized art "actions." Although the concerns of performance artists have changed since the 1960s, the genre has remained a constant presence, and has largely been welcomed into the conventional museums and galleries from which it was once excluded.