A regenerative building is not a collection of independent systems that happen to share a roof. It is an integrated organism in which each system feeds and supports the others, creating relationships of mutual reinforcement that produce performance greater than the sum of the parts. Understanding these relationships, the feedback loops, the shared inputs and outputs, the synergies between systems, is the core intellectual task of regenerative design.

This chapter introduces each of the six systems in the Pangea model and, more importantly, maps the connections between them. Later books in this series cover each system in the technical depth needed for design and construction. Here, the goal is integration: to see the whole before studying the parts.