This chapter explores the use of “responsive” or “interactive” urban media technologies as a tool or “building block” in the (re)design of urban public spaces. This is especially relevant as in the last two decades, urban development and digital technologies have brought out new types of urban typologies and practices often referred to as “networked urbanism.” These typologies and practices bring out specific challenges with regard to their functioning as public space. We argue that responsive technologies could reinforce qualities of public space in this condition of “networked urbanism”; however, their implementation demands new strategies and above all new forms of cooperation between disciplines such as architecture, urban design, and urban interaction design. To aid such an approach, this chapter introduces a heuristic of five mechanisms of responsive media. These are meant to function as a shared vocabulary aiding designers of various backgrounds to collaborate in an interdisciplinary design process for public spaces in a broader development of networked urbanism.