The object of this work is technics, apprehended as the horizon of all possibility to come and of all possibility of a future. This question still seemed secondary when, ten years ago, I was setting down its first delineations. Today, it informs all types of research, and the enormousness of the question summons us all. This calls for a work whose urgency is still hardly grasped despite the high stakes of the issue and the disquiet it arouses— a long and exacting task, as exciting as it will be difficult, stirring a necessary but deaf and dangerous impatience. Here I would like to warn the reader of this difficulty and of its necessity: at its very origin and up until now, philosophy has repressed technics as an object of thought. Technics is the unthought.