This book includes the last words of a thinker who never stopped facing the questions of the world, time, wandering, play, and technique. Through this search for the unthinkable, Kostas Axelos detects, on the threshold of death, the secret of secrets and listens to the concern of modern man in an era dominated by technical rationality. Here, the dominant question is the question of the unthinkable "which is something more and different from what we have not thought of", a question that overwhelms and calls upon man. It is the question of this enigma of time, which asks to be explored by man, the thinking fragment of the world, tormented by anxiety, borne by world history, and thrown into the technical-scientific adventure. This search for the unthinkable requires vigilance and courage, but it also requires the torment and action of those "poetic thinkers who left behind the flat pursuit of happiness". It is precisely this fundamental struggle that Axelos' thought proposes that we accept, showing us at the same time that, yes, it is possible to chart the path of a restless tranquility, testing it in a decisive and radical way.