This study examines the concepts of art, politics and art institution departing from three cases of exhibition situations at Moderna Museet in Stockholm, 1998–2008. The cases are considered in relation to different aspects of the museum’s identity as an art institution. The first case, the Pontus Hultén Study Gallery (2008–), is an interactive exhibition space containing 34 mechanical screens for displaying art. It is understood here as a comment on the museum’s identity as a collecting institution. The author critically analyses a number of common oppositions in avant-garde theory regarding museum culture, such as the museum as a place for passivity rather than activity, preservation rather than initiation, and ultimately death rather than life. The second case, the exhibition series Moderna Museet Projekt (1998–2001), was marked by the ambition to integrate artworks into contexts outside the physical museum building. Here case analyses focus on the distinction that the series established between art and a presumed alternative, such as life, reality, or politics. The third and last case, the sound installation Forty-Part Motet (2001) by Janet Cardiff, was installed in an exhibition space that actualised the ideals of the so-called white cube. In the institutional critique of the 1960s and 1970s, this exhibition space was dismissed as isolated and detached from society, an idea that is critically examined. Throughout the different case studies, spectator positions and potential agency are of particular concern. This thesis concludes that the concepts of art and politics are different permeable forms of experiences, visibilities and practices, that cross and intertwine. This conclusion is informed by Jacques Rancière’s notions of aesthetics and politics. In this reading, the art institution is not a barrier separating art from politics, reality or life, but nor is it a dead or deadening space. Rather, the art institution, as a social space and concept of art, is considered as intertwined with other forms of visibilities and experiences. Thus, regarded as a frame for a certain type of visibility, the art institution is capable of establishing a difference that is both unproblematic and urgent.