Pilot project to M.I.R. – Mobile Interface Radio by Team Hallenbau A (Mike Gerber, Matthias Gieselmann, Robin-Antonius Henke, Florian Krupicka, Alexander Liebrich, David Loscher, Florian Wesch, Marco Zampella and Frank Halbig [head of the project].) The radio play “Hallenbau A” is a pilot project. While the listener is moving around the campus of the HfG and the ZKM, he hears fragments of the turbulent history of the building. Although not all the possibilities of interaction are exploited, “Hallenbau A” gives an idea of ​​what interactive radio plays can offer. The MIR project at the University of Art and Design Karlsruhe researches interactive radio plays on smartphones. Extensive possibilities of interaction (e.g. the inclusion of the environmental information at the time and place of the listener) allow the “Brechtian return path to radio.”