Architectural objects as ontologically distinctive. Yet another way to pick out architectural objects is to set them apart from other art objects or artifacts. Assuming there is more than one art ontology (see Livingston 2013), we might look to define a distinctive architectural ontology by reference to specifically architectural qualities, such as “mass” (degrees of heaviness and lightness) or directedness (in circulatory pathways); or utility considerations, such as functional design, use, and change; or everyday artifactual features. An inclusivist may add features special to the built environment beyond the realm of buildings.