Augusto Boal is one of the active forces behind the Arena Theater in Brazil, and he is the creator of the Joker system, as well as one of the writers of "Arena tells about ZumbĂ", an early example of the Joker system at the Arena Theater. Boal analyzes theater from a Marxist perspective and believes that the function of theater should be to educate the masses in preparation for a revolution. Theater of the oppressed is theater opposed to oppression, Boal's counter to oppressive Aristotelian theater, which he believes encompasses all mainstream media.