Subjectivity is now a creative project. This is its design manual. Ontological design is a discipline for designing human subjects. At its core is the feedback loop : the idea that by designing objects, spaces, tools or experiences, we are designing human subjects. The structures of subjectivity we inherited from previous centuries cannot handle the digital age. The most fundamental thing being disrupted by technocapitalism is Humanity itself. However, this book does not deny or run away from this disruption. It leans into it, formulating it into a theory for architecting subjectivity . Here, the subject is a project framed via its social relations, behaviour and beliefs. The tools of this craft are multidisciplinary, and their goal is of the utmost depth: engaging with our very sense of existence, of reality and of being. Ontological design does not take “reality” for granted nor accept it as a given; it seeks to design it. It questions its assumptions, investigates its phenomenal appearance and tracks its tendencies. Ontological design is not only about using multidisciplinary design tools like as architecture, urbanism, digital design, virtual or augmented realities to design contexts. It is also not only about crossing design with extra-disciplinary skillsets, like behaviourism, spatial computing, persuasion or data anthropology techniques. It is about grouping all of these parameters under the umbrella of holistic project, the post-human. This book challenges us to establish a creative relationship with that which is by definition occult (absent, unknowable, Unconscious). We cannot be scared of thinking Design through to its ultimate consequences: as the design of religion, the design of war and of how humans relate to Death. That is how we wrest the ancient crafts of ontological creativity from the monopoly of organised religions, intelligence agencies, media conglomerates, corporations and non-linear military operatives. In the age of the algorithm, ontological design is not only about new ways to attack, manipulate or exploit. It is also a question of self-defense, and above all, of creativity. The next era is waiting to be created. Design and “brainwashing” won’t be too far apart as disciplines in the near future. That is precisely why it is ethical to explore even the darkest outcomes of such a craft. In the face of this prospect, the solution is not to return to some imagined previous state of harmony and completeness, but rather, to carry our own contradictions into the new paradigm and in there struggle to come up with new modes to practice freedom and be truly creative. For freedom requires power, and power demands that we be not afraid to look it in the eye.