In this paper, we propose to consider the sonic interactions that occurs in a dance performance from an ecological perspective. In particular, we suggest using the conceptual models of artefact ecology and design space. As a case study, we present a work developed during a two weeks artistic residency in collaboration between a sound designer, one choreographer, and two dancers. During the residency both an interactive sound artefact based on a motion capture system, and a dance performance were developed. We present the ecology of an interactive sound artefact developed for the dance performance, with the objective to analyse how the ecology of multiple actors relate themselves to the interactive artefact. CCS CONCEPTS • Human-centered computing → Interaction design process and methods; Empirical studies in interaction design; • Applied computing → Sound and music computing; Performing arts.