The contributors to the volume explore this multifaceted interchange in its broad thematic manifestations and historical depth, focusing above all on three aspects: machines that assist in the design and construction of buildings, those that perform their tasks inside the walls and structures of buildings, and – in particular – machines that act as models and images of architectural thought. What emerges is that the subject of machines within the architectural framework has been rooted, up until the present day, not simply in concrete technical questions, but rather to a far greater extent in general programs, processes, and performances, and thus in fundamental categories of built space.