This book re-energizes metafiction studies through the posthuman discourses of performativity, neocybernetics, and diffraction. My contention is that the human experience can be viewed as a metafictioning manifold, i.e., an active self-perpetuating entanglement and emergence of narrativizing structures. Metafictions, then, are living artifacts that model the metafictional processes of our experiences, while also actively re-organizing those experiences and acting as heuristics for engaging with the world with openness to the material ecology of the metafictioning manifold. Renewed attention should be given to metafictionality, and to metafictional artifacts in particular, to better engage with our material reality as co-participant storytellers alongside the objects and systems around us. The introductory chapters set the critical and methodological stage. Chapter Three uses David Markson’s This is not a Novel (2001) to demonstrate the performativity of metafictions and objects. Chapter Four discusses The Third Policeman (1967) by Flann O’Brien and identifies metafictions as living systems. Chapter Five looks at Jerzy Kosinski’s Being There (1970) in order to theorize the agential natures of such object-systems, while Chapter Six investigates the heuristic ethos of a metafictioning manifold through Mark Z. Danielewski’s The Familiar (2015). The epilogue synthesizes these various threads to establish the metafictional novel as a particular type of apparatus for encountering the objects, systems, patterns, and practices of the metafictioning manifold.