Philip Bess, Why Architecture Matters, Part III: Urban Formal Order and Natural Law

pretty good stuff, though controversial:

It is the thesis of what follows that, given this understanding and characterization of both natural law and the Rural-to-Urban Transect, the proposition

Human beings should make mixed-use walkable settlements

is generally valid for all human beings in all times and places---and therefore constitutes a natural law precept. If this is true, such a precept would be binding in conscience for---and acted upon with prudential judgment by---all persons who act in accordance with right (practical) reason; and most especially for and by persons who understand themselves to be a part of the Aristotelian-Thomist intellectual tradition.