In the present paper, a posthumanist approach is used to analyse children's play activities in natural environments. The aim is to analyse intra-actions between children, the material environment and discourses, with a focus on the material and embodied aspects of these intra-actions. Forty-two children between six and eight years and from two Swedish schools participated in the study. Video observations of play activities have been the most important data source. For the analysis of how matter acts', play with sensorimotor content has been distinguished from play with symbolic content. In sensorimotor play, matter seems to talk' more directly to children's hands and bodies. In play activities with symbolic content, matter works both directly and through discourses, when objects are given symbolic meaning. In both kinds of play, discursive practices in the peer groups are influential.