Architecture and nature cannot exist as two of the same. While architecture is the product of our need to create or to control space for our own benefit, nature simply ‘is’ for its own benefit. The title Obverse Ecologies is a direct reaction of the separation between the constructed environment and nature: obverse - corresponding to something else as its opposite or counterpart; ecologies - connections and interactions between organisms and their environment. This thesis is an exploration of architecture and nature as opposite counterparts in a mutually beneficial relationship. It attempts to rectify a possible future where nature exists within the constructed environment of the Toronto port lands. This project explores architecture as an ecotone. It attempts to reintroduce a gradient boundary where the constructed environment and Nature can exist at the same time and rectify the connections and interactions between these obverse ecologies.