The domestic spaces of the built environment are traditionally associated with residential architecture. But the domestic spaces can also extend out, metaphorically, into familiar public spaces in which one may feel at home, and also extend inwards into self-perception, insofar as you may say that you dwell within yourself. This article begins by recalling Vitruvius’ fundamental notion of architectural utilitas concerns accommodating not a building’s owners but foreigners and strange outsiders. Vitruvius’ view on utility heavily favoured architecture’s socio-political function, and (...) the guests he believed that architecture ought to accommodate were not merely a home’s owners or their visiting friends, but those people who are more distant from a home’s owners: those who are stranger and less well understood, known as xenos and who ought to be respected under the Ancient Greek religious and ethical principle of xenia. It is on these grounds that Vitruvius makes an ethical critique of residential architecture in favour of the virtue of public architecture. Next the reach of xenia is proposed to extend towards those who are different not merely because of ethnic differences but cognitive and sensory differences. Such accommodations are today accounted for as part of accessibility design and salutogenic design. Similar conceptions are noted in Nietzsche’s notion of an “architecture for the perceptive” and the surrealist’s interpretation of the minotaur as a hybrid not only of animal and human but a hybrid of civilised citizen and barbarian outsider. Together these sketch out an expanded sense of the domestic that includes public spaces designed to accommodate strange outsiders and the hybrid forms used to signify them. (shrink)