One approach to grasping the true nature of architecture is to define it in terms of the discipline. We may embrace the disciplinary determinism of the British architect Cedric Price: “Architecture is what architects do”. Defining the discipline or practice of architecture may seem a simple empirical affair. Even if we have difficulty assessing what architectural objects or products are, we can point to thousands of architects over several millennia around the world engaged in one or another sets of activities that conventionally have been associated with architectural practice, and generate a long disjunctive claim about what architects do. An empirically rooted approach has a long history: Vitruvius devises his normative account of the virtuous architect on the basis of his familiarity with then-contemporary practice. The same is true of other traditional accounts of virtue in architects or builders, as in the sixth to eighth century Indian Mānasāra (मानसार) (Acharya 1928) and eleventh century Chinese Yingzao fashi (營造法式) (Feng 2012). In the present-day, sociology of the architectural profession offers a detailed empirical perspective (Gutman 1988), and this can be extended to a sociology of architectural worlds, modeled on Becker’s sociology of art worlds. 