Significant Modern Theatres: Musiktheater im Revier, Gelsenkirchen TD&T discusses the Musiktheater im Revier in Gelsenkirchen as part of its multi-year research collaboration with Bühnentechnische Rundschau, the journal of the Deutsche Theatertechnische Gesellschaft (Germany's Theatre Technical Society) and Sightline, the journal of the Association of British Theatre technicians. Under the auspices of this project, noted specialists in theatrical architecture are producing an ongoing series of articles celebrating and re-examining some of the most significant theatres that opened between 1950 and 2010. The project is led by David Staples, theatre consultant. The research informed the International Theatre Engineering and Architecture Conference (ITEAC) held in London in 2018. The articles will be published in a book entitled Modern Theatres 1950 to 2020. 16 | THEATRE DESIGN & TECHNOLOGY | WINTER 2021 Ives Klein's Blue Sponge Relief in the Musiktheater im Revier. | Photo copyright and courtesy of Dietrich Hackenberg, info@lichtbild.org.