"Field of Edges" investigates how design modulates social and material worlds. Operative systems, infrastructural (freeways, roads) and ecological (bayous, land mosaics), provide objects of study to investigate territoriality and colonization. These systems are examined at the regional scale, the scale that connects the local with the global. Planimetric and sectional strategies are developed to maintain continuity and functioning as differing systems must navigate one another and the larger context. The strategies also offer methods of systems mapping one another through the design of performative substrates such that edges between systems manifest territoriality as thresholds or gradients, and thus the social world of interacting and competing agencies is manifested in material assemblages. The project takes as its site the existing urban condition of Houston and attempts to re-integrate or re-optimize fragmented regional networks.