political

"Politics (from Greek: Πολιτικά, politiká, 'affairs of the cities') is the set of activities that are associated with making decisions in groups, or other forms of power relations among individuals, such as the distribution of resources or status."

Art is public and by nature of showing one viewpoint instigates a political position - i.e. it holds potential political power as a topic for debate that may change relationships of power, status, etc. with each other and the world.

Even a cave painting is political, because it's a guy saying "I'm the one with spears who catches and eats the bull". It's establishing a power relationship, a potential form of human organization, via crude art.