This essay postulates that idealised diagrams of the body - represented by two of architecture’s most prominent images, the Vitruvian Man and the Modulor Man - are no longer sufficient definitions in a networked, digital world. Instead, a view of the body as ‘transactional’ is suggested; it is defined as mediator between consciousness and environment. Drawing on multiple contemporary technological examples (from mobile phones to web-sensing vests) the essay proposes that the boundary between body and environment is becoming increasingly permeable and therefore unclear. Framed in this way, the blurring of the body/environment boundary is facilitated by a binary shift in scale. The body is scaled up as devices that extend sensory and manipulative capacity distribute the body’s functions across global networks, and architectural infrastructure is scaled down - contemporary networks are increasingly diffused into these body-scale devices.