Architects typically embrace the Vitruvian premium on firmitas and reasonably assume that built objects should endure—and that they serve intended functions for as long as is desirable. That pair of assumptions in design thinking is at odds with concretism, given corruption and decay of physical constructions as well as routine repurposing in the lives of built structures.  The first assumption is consistent with an abstractist vision of everlasting architectural objects. Endurance of serving intended functions is another story: for architectural abstracta, stipulation of repurposing may not change the nature of a given, selfsame object. Depending on degrees of stringency in defining an object’s parameters, corresponding changes in design may bring about an entirely new object or nearby counterpart.