Known and Unknown Stone: Papuan Petrology and Reciprocity

What is knowable about stone tool users’ knowledge? The people of the New Guinea Highlands were among the last to use stone implements routinely in their daily lives. These comprised both lithic flake tools and polished stone axes. Their classification of these objects challenges our notion of taxonomic knowledge, which involves agreement over defined classes, whereas they evidence considerable disagreement with unclear categories. It is necessary to situate stone within the egalitarian acephalous cultures where reciprocity features centrally to appreciate the ontological status of stone.