"At a gut level Haacke is asking this question: is there really any difference between the power of money to control the direction of art and the power of money to keep rotten slums in existence? Haacke, being an artist, has not consciously set out to organize the relationships I have indicated. But it is obvious that his "Systems Art" has entered a new phase. In its semiotic structure it draws closer to the ritual drama (where the artist's premises are recapitulated in everyday life) and away from the plastic arts..."
January 1, 1970
https://en.wikiquote.org/wiki/Systems_art