In this paper, we describe our design research on tangible play objects that stimulate social and physical play. We illustrate our work by describing a design case about an open-ended play object for children called the ColorFlare. The ColorFlare is an object that detects the player's movements and provides light feedback and that can communicate with other ColorFlares. A user test is described that examined how children use the ColorFlare to collaboratively create various (physical) games. We relate our research to definitions of embodied interaction, for example by describing how children allocate meaning to the interaction behavior of the play objects and jointly create diverse games during the play sessions