Architects design and plan buildings. Yet their field of activity has always been more diverse than that and has continually evolved as complexity and specialization have increased. Today, architects increasingly work in an interdisciplinary manner and often outside the realm of traditional construction—for example, in research, teaching, consulting, or writing. At the same time, “not building”—or the ability to recognize when architecture does more harm than good—is gaining importance. The current debate over the development of Tempelhofer Feld in Berlin shows just how politically and socially relevant this insight is. Architecture is more than just building. It is also about responsibility, attitude, and collective action.