The National Endowment for the Arts celebrates the milestone. An exhibition gives some idea how far. “We’ve come a long way. Parallel to the art of engagement has been a politics of disengagement, at least when it comes to arts funding. The only reason the NEA could meet in the midst of this exhibition without a firestorm is that, politically, the NEA has disengaged not just from funding this kind of art, but from the people, artists, curators and audiences who are interested in it.”