This paper addresses design agendas in Human-Computer Interaction and neighbouring fields motivated by the mixing of areas that were mostly kept separate until recently, such as media studies, performing arts, computing, and ubiquitous or tangible interfaces. Referring to new developments in this interdisciplinary research area, and moving from three specific design cases, this paper proposes a critical design agenda that pragmatically joins: concepts from media studies, tangible or ubiquitous media design concerns, anthropological perspectives to performance and practices of theatre performance. ON DESIGN AGENDAS AND UBIQUITOUS MEDIA A discussion on design agendas in Human-Computer Interaction and neighbouring fields is made particularly timely by the mixing of areas that were mostly kept separate until recently, for example, media production, computing, and ubiquitous or tangible interfaces. We refer to this mixed area with the concept of ubiquitous media, for which we propose a cri...