'Extra Bodies', the new theoretical volume in the Migros Museum series, is based on the PhD research of Migros Museum für Gegenwartskunst?s curator Raphael Gygax, and accompanies the related exhibition (November 2017-February 2018). Both investigate an artistic phenomenon that started in the 1990s in the field of the performing arts, and is characterized by artists using 'other bodies' in their practices and making their 'vitality' a central part of their artworks. One of the main strategies of this approach is using the specific social roles of these other bodies, thus making the societal dimension a core element of the work?these other bodies are also described as 'extras.' This volume contextualizes the appearance of these other bodies in the broader context of the 1990s, especially in relation to Relational Aesthetics and its theoretical devices. The publication also analyzes the transition from the use of a 'bio-political' body to a 'psycho-political' body, as seen over the last 30 years.00Exhibition: Migros Museum für Gegenwartskunst, Zurich, Switzerland (18.11.2017-04.02.2018).