Another alternative suggests that architecture consists in actions or performances (per Currie 1989; D. Davies 2004), rendering derivative any concrete structures or “traditional” abstract entities. Lopes (2007) proposes the possibility of an events or temporal parts ontology for a kind of built structure that passes in and out of existence, though De Clercq (2008, 2012) counters that such can be rendered in a material objects ontology through temporal indexing. Yet other ontologies are contextual or social constructivist, proposing that architectural objects exist, beyond their status as structured materials, in virtue of ways our reality is framed, psychologically, socially, or culturally (per Hartmann 1953, Margolis 1958). A shift in any such frame may bring about shifting identity in an architectural object, in the manner of Borgesian art indiscernibles (Danto 1964), and it may count in favor of those ontologies that architectural indiscernibles are all around, in the form of repurposed built structures.