Marc Applebaum discusses the layers of the ego through the lens of phenomenological psychology, emphasizing the relationship between the self and the other. He explores concepts such as primordial empathy, pre-egoic care, and the interlacing of self and others within the context of embodied experiences. The work also reflects on existential ethics derived from the insights of philosophers like Nishida Kitaro and Nishitani Keiji, while distinguishing the roles of phenomenology and mysticism in understanding these themes.