A4 is durational installation / performance that was created for the first time as a preparation for the work Catch 22 in 2007 at the Kunstverein Freiburg. It wasn’t performed in front of the audience until 2011, when it was presented at the _Nacht der Bibliotheken _in the Volkswagen university library of Berlin. The installation was receantely presented during the co-creation NOW and THEN that had its premier in February 2018.