In the following text, author Daniel Zwangsleitner introduces us to a brief history of the post-war housing cooperatives and governmental building policies in Graz and Styria, a hot bed for the architectural avant-garde in Austria. In addition, he illustrates how the experimental 1967 exhibition trigon 67 influenced the ideas and coercion of participatory art and architecture in the area, leading to many new housing projects in which participation by its future inhabitants were key factors.