This article examines the origins not only of the media that underlie logistical operation, but the techniques that have shaped and structured them. To do so, I focus on the logistical technique of assembly. Not just of parts, but of places and people. Assembly, here, becomes an ur-mediative technique, one produced both before and beside the attendant media functions of storage and transmission. Long before its instantiation in the operations of contemporary software systems, I examine how this logistical technique emerged in the confines of sites like the ancient storehouse. As I do, I consider how the abstract forms of mediation developed there made warehouses accessible as a new kind of virtual assembly, precipitating the instrumental order critical to the operation of the global supply chain.