What if you were marooned amidst an endless ocean, forced to construct a world capable of protecting and sustaining you?In How to Build a World, Federico Campagna invites the reader to join him in a sustained thought experiment, reimagining the most fundamental questions of philosophy, metaphysics and politics as we create our own worlds. From situating our creation amid the rubble of previous ideologies to selecting the ontological foundations, raising the metaphysical walls and building the social and political moorings where one world can touch another, this uniquely accessible book lays bare the philosophical architecture which structures reality – and opens up the possibility of its reimagining.Drawing on city planning, computer-generated environments and the shared play worlds of videogames and RPGs as well as the greatest minds in the history of global philosophy, Campagna reveals how every one of us is engaged in creation amidst catastrophe. Elegant, erudite and engaging, How to Build a World is an invitation to participate more consciously in constructing reality, and a blueprint for creating more resilient, flexible and diverse spaces for us to inhabit.