The course of human life, punctuated by unexpected and transformative moments, is never uniform. What are the characteristics of such life-defining moments, what responses do they evoke, and how do they transform the lives of those who experience them? In Vivo explores foundational questions and pivotal moments of the human experience - engagement with a foreign culture, the decision to break free from unfortunate experiences, a generous action undertaken in the context of an otherwise regular day - in terms of their life-altering potential. Through illustrative examples, both real and fictional, Csepregi reveals the primacy of personal feelings in shaping human life and demonstrates the formative power of spontaneity outside the traditional context of formal education. These moments, and particularly the way they disrupt ordinary temporal order, Csepregi argues, are the lived experiences of our vitality. In an age marked by increasing anxiety about the homogenizing tendencies of contemporary life, In Vivo is timely and revelatory. Informed by a range of philosophical thinking and examples from art, music, and literature, it illustrates opportunities for meaningful reflection that are available to everyone, and urges the reader to engage with them.