The main purpose of this paper is to examine the ‘existence theory’ proposed by Patrick Baert, Marcus Morgan, and Rin Ushiyama. To this end, it focuses on some key issues that could, and arguably should, be explored in more detail, especially if the authors decide to develop their project further, permitting them to establish a new interdisciplinary branch of inquiry. The comments and suggestions made in this paper are meant to be constructive, supporting the idea that Baert, Morgan, and Ushiyama’s (...) outline could, and should, be turned into a bold, systematic, and long-term research programme. More specifically, the in-depth analysis of Baert, Morgan, and Ushiyama’s theoretical framework demonstrates that their undertaking, which draws on central insights from both existentialism and phenomenology, contributes to bridging the disciplinary gap between philosophy and sociology. The paper concludes by asserting that Baert, Morgan, and Ushiyama’s model provides a solid foundation for an ambitious, but viable, project that may result in the creation of a new current of research, capable of generating valuable insights into the tension-laden confluence of existential milestones, existential ladders, and existential urgencies in the theatre of human life. (shrink)