Rather than refuting or challenging the claims by Baert, Morgan, and Ushiyama to originality, the objective of this commentary is to flesh out “existence theory” by extending its repertoire of examples and by expanding on its classical and philosophical sources. Drawing on precedents in canonical statements by Vico, Weber, Durkheim, Simmel, and Marx, this response poses questions about the model’s implied assumption of a time-line that traces a “straight” path from the past to the present and future by invoking the alternative imagery of a circular history, cyclical time, or “queer” life course. To support this argument, contemporary queer theories are invoked to supplement the concept-metaphor of “existential milestones” with that of “existential cornerstones,” which do not always suggest that human development follows a single path or a binding timeline. The civil institutions of religion, marriage, and burial, as discussed by both classical sociologists and queer theorists, for instance, may be defined by a sense of necessity and inevitability but also by contingency and coincidence.
