This book offers a manifesto for a radical existentialism aiming to regenerate the place of the outside that contemporary theory underestimates. Neyrat calls this outside "atopia" not utopia, a dreamt place out of the world where everything would be perfect, but atopia, the internal outside that is at the core of every being. Atopia is neither an object that an "object-oriented ontology" would be able to formalize, nor the matter that "new materialisms"...