Animists' theories of matter must be given equivalence at the level of theory if we are to understand adequately the nature of ontological difference in the past. The current model is of a natural ontological continuum that connects all cultures, grounding our culturally relativist worldviews in a common world. Indigenous peoples' worlds are thought of as fascinating but ultimately mistaken ways of knowing the world. We demonstrate how ontologically oriented theorists Eduardo Viveiros de Castro, Karen Barad and Tim Ingold in conjuncture with an anti-representationalist methodology can provide the necessary conditions for alternative ontologies to emerge in archaeology. Anthropo-zoomorphic ‘body-pots’ from first-millennium ad northwest Argentina anticipate the possibility that matter was conceptualized as chronically unstable, inherently undifferentiated, and ultimately practice-dependent.

Bruno Latour and Eduardo Viveiros de Castro provided the initial impetus for explicitly ontological research in archaeology. Their impact on archaeologists, however, has been quite different. What I call the “metaphysical archaeologists” trace their genealogy from Latour, though they are now equally influenced by “new materialism” and the “new ontological realism” ( Gabriel 2015 ). They have introduced an alternative metaphysical orthodoxy to archaeology. In contrast, Viveiros de Castro and colleagues have authorized the return of the grand ethnographic analogy to archaeology, particularly in the case of animism. A second, quite different tendency inspired by these same anthropologists is to engage with indigenous ideas as theories to reconfigure archaeological concepts and practice. I suggest that a point of convergence between the metaphysical and the latter anthropological approaches exists in their focus on the concept of alterity.

This article explores the implications of adopting Karen Barad's agential realist approach in archaeology. We argue that the location of Barad's work in quantum physics and feminism means it is uniquely placed to inform the ontological turn currently gaining favour for understanding the materiality of bodies. We outline Barad's approach using a comparative reading of Sofaer's book The Body as Material Culture and Barad's Meeting the Universe Halfway. To illustrate, we think through Barad's key concepts of 'phenomenon ', 'intra-action' and 'apparatus' in relation to specific archaeological bodies; New Zealand Maori chevron amulets, Argentinean La Candelaria body-pots, Pacific Northwest Coast stone artefacts and Nuu-chah-nulth ceremonial objects. Barad's theory transforms the way we understand and think these object bodies. In particular, her relational ontology, which contrasts with a conventional binary separation of matter and meaning, produces difference in a new way; a difference which facilitates analyses conceptually unthinkable in conventional representationalist terms.

The debate concerning ontology is heating up in the social sciences. How is this impacting anthropology and archaeology? What contributions can these disciplines make? Following a session at the 2010 Theoretical Archaeology Group conference at Brown University ("'Worlds Otherwise': Archaeology, Theory, and Ontological Difference," convened by Ben Alberti and Yvonne Marshall), a group of archaeologists and anthropologists have continued to discuss the merits, possibilities, and problems of an ontologically oriented approach. The current paper is a portion of this larger conversation-a format we maintain here because, among other things, it permits a welcome level of candor and simplicity. In this forum we present two questions (written by Alberti and Witmore, along with the concluding comments) and the responses of five of the Theoretical Archaeology Group session participants. The first question asks why we think an ontological approach is important to our respective fields; the second, building upon the first set of responses, asks authors to consider the difference that pluralizing ontology might make and whether such a move is desirable given the aims of archaeology and anthropology. While several angles on ontology come through in the conversation, all share an interest in more immanent understandings that arise within specific situations and that are perhaps best described as thoroughly entangled rather than transcendent and/ or oppositional in any straightforward sense. The Ontological Turn: A Question of Relevance and Contribution Recent years have witnessed a dramatic increase in academic labor concerned with ontology. Across the humanities and sciences this surge goes by many names: the (re)turn to things