This paper examines the technologisation of the pedagogical space "classroom". We will discuss the development and establishment of the subject-specific classroom system in the German Democratic Republic (GDR, East Germany, 1949-1989) by taking a closer look at organisational-structural conditions and responsibilities, as well as at the functioning and challenges that emerged during the implementation of subject classrooms. The furnishing of the subject classroom with seating, desks, teaching and learning objects including technical equipment, and storage furniture was planned down to the last detail and aligned to the requirements of the curriculum. We will concentrate on the classrooms for Physics and Music to highlight the peculiarities of this principle of school spatial organisation and its impact on social school practice. Our paper will focus on the political agenda and regulations, by drawing on sources from state-led research programmes. The article uses the concept of the classroom dispositif as a description of the programmatic claims. Thus, the subject-specific classroom could be considered as a technically shaped apparatus whose architectural structure determines pedagogical practices in their spatial, temporal, social, institutional, and technical dimensions.