Living Architecture is a new model of sustainable architecture that directly connects the built environment to nature. It views architecture as part of the biosphere, integrated through a common chemical language called metabolism. This allows living systems to be connected to their environment. Metabolic materials are capable of metabolism and can be considered a form of living technology. They possess some properties of living systems and can grow, move, and reproduce. For practical purposes in architecture, these materials need to be robust, safe, inexpensive, and ubiquitous. Innovation can occur by designing with existing metabolic systems and materials or inventing new low-tech chemical computers like programmable protocell technology.