This practice-based PhD explores the role of physical material as used in art, in social art processes. Here the material stone is the starting point for geological studies and practical explorations such as photography and a stone-carving project. Detailed observation of the phases of work in this project then lead on to elaborate a working model for creative processes that might form the basis of participatory social art practice. An account of my journey of practical explorations in this PhD is accompanied and supported in section 2 by studies of two sculptors. The first, K. Prantl, is rooted in a classical view of material in sculpture, whereas the other, J. Beuys, integrated the material stone into his “theory of sculptural processes”,...