Any city is comprised of many systems—economic, technological, social, cultural—which overlay and interact with one another in complex ways. Each system is different, but from one point of view all share a common purpose–the organization of energy—and a common goal—giving the cumulative energy of the city a coherent form.
According to Maxwell’s second law of thermodynamics, the entropy in a system will increase (it will lose energy) unless new energy is put in.
According to Newton’s law of inertia, a system will stay at rest unless it is disturbed by an external force.
Energy exists in two states: kinetic and potential. A brick sits on top of a wall—potential (it could fall). A brick is pushed from the top of the wall—kinetic (its potential is released).
Energy takes many forms, each created by a system that contains it for a particular purpose. Architecture is one such system that contains energy by establishing stable boundaries, limits, edges. New energy—in the form of maintenance—must continually be added to the system of materials, or they will decay. Metaphysically speaking, new energy—in the form of human thought, emotion, activity—must continually be added to the system of boundaries, or they will lose their purpose and meaning
(http://lebbeuswoods.wordpress.com/2009/06/05/architecture-of-energy/)
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