One traditional division of architectural knowledge promoted by architectural historians, theorists, and practitioners—and focusing squarely on creator’s knowledge—has it that there are two basic kinds: the theoretical/historical and the practical (J. W. Robinson 2001). Theoretical and historical brands of architectural knowledge encompass viable beliefs about familiar core concerns of architecture, including basic design elements of the built environment; their combinations, relations, and properties; their style; external factors (social, economic, cultural, etc.) which shape design; and historical contexts into which they fit. Some such beliefs are empirically supported; others not. Practical brands of architectural knowledge encompass viable beliefs about the engineering and technical means of constructing architectural objects, ensuring structural integrity, and guaranteeing mechanical function, socially, industrially, or ecologically beneficial use. Such beliefs—particularly as hitched to formalized, experimental, or predictive dimensions of the enterprise—are sometimes seen as constituting an architectural science. They are typically (though not exclusively) empirical in character and, to some tastes, relegated to a status of adjunct architectural knowledge, that is, useful for architecture but outside the domain proper. What counts as practical knowledge in architecture is often seen as encompassing beliefs of a largely non-aesthetic nature.