The text deals with three different interventions into art exhibitions. The first approach is an account about the intervention at Documenta 12, questioning the possibilities of art reception and artworks through physical acting and re-acting. The second example describes a counter-reading of an exhibition through different forms of every-day knowledge: building of the 6th Berlin Biennale which showed artistic works using forms and evoking associations about squatting was counter-read by former squatters. The third example is about squatting an exhibition about the issue of migration by refugees and activists. By doing an exhibition in the exhibition about their own life, they question the intention and political seriousness of the cultural institution—in this case the German Historical Museum. All three examples confront art institutions with different forms of knowledge and describe the fields of gallery education. How can we »apply« art and what is the possibility and responsibility of gallery education to become an atelier to question contemporary society?