Based on an analysis of the American Lifenaut research project, I attempt to capture immortality created today as a network of relationships among human and non-human factors. Lifenaut was established in 2006 as a pioneering project in the fi eld of creating posthumous digital avatars. The users involved in the experiment gather data on the www.lifenaut.com platform to retain their personality in a digitized form after biological death. Part of my work is reconstructive – I describe the assumptions of the American project and the main concepts associated with it, such as “mindclone”, “mindfi les” and “mindware”. In the second part I present the results of my own avatar creation experiment and confront them with the sociological perspective of symbolic interactionism (G.H. Mead, H. Blumer) and relational sociology (B. Latour).