The papers that make up the volume are aimed at contextualising, elucidating, interrogating and applying a distinction that is at the cutting edge of many investigations in recent philosophy. This is the distinction between the bona fide objects that are differentiated from their surroundings by some natural discontinuity and the fiat objects whose contours are fixed by some determination or stipulation laid down by one or more minds. From the dawn of the Western philosophical tradition (but also, for instance, in some schools of Buddhist thought) down to the most recent debates in the ontology of the social world and in the philosophy of biology, similar distinctions have had an enduring role to play in the search to discriminate between w...