We propose an approach to creating shared mixed realities based on the construction of transparent boundaries between real and virtual spaces. First, we introduce a taxonomy that classifies current approaches to shared spaces according to the three dimensions of transportation, artificiality, and spatiality. Second, we discuss our experience of staging a poetry performance simultaneously within real and virtual theaters. This demonstrates the complexities involved in establishing social interaction between real and virtual spaces and motivates the development of a systematic approach to mixing realities. Third, we introduce and demonstrate the technique of mixed-reality boundaries as a way of joining real and virtual spaces together in order to address some of these problems.

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MATT ADAMS, NICK TANDAVANITJ, and JU ROW FARR, Blast TheoryWe explore the approach of performance-led research in the wild in which artists drive the creation of novel performances with the support of HCI researchers that are then deployed and studied at public performance in cultural settings such as galleries, festivals and on the city streets. We motivate the approach and then describe how it consists of three distinct activities -practice, studies and theory -that are interleaved in complex ways through nine different relationships. We present a historical account of how the approach has evolved over a fifteen-year period, charting the evolution of a complex web of projects, papers, and relationships between them. We articulate the challenges of pursuing each activity as well as overarching challenges of balancing artistic and research interests, flexible management of relationships, and finally ethics.

The idea of interactional trajectories through interfaces has emerged as a sensitizing concept from recent studies of tangible interfaces and interaction in museums and galleries. We put this concept to work as a lens to reflect on published studies of complex user experiences that extend over space and time and involve multiple roles and interfaces. We develop a conceptual framework in which trajectories explain these user experiences as journeys through hybrid structures, punctuated by transitions, and in which interactivity and collaboration are orchestrated. Our framework is intended to sensitize future studies, help distill craft knowledge into design guidelines and patterns, identify technology requirements, and provide a boundary object to connect HCI with Performance Studies.

A study of a professional touring mixed reality performance called Desert Rain yields insights into how performers orchestrate players' engagement in an interactive experience. Six players at a time journey through an extended physical and virtual set. Each sees a virtual world projected onto a screen made from a fine water spray. This acts as a traversable interface, supporting the illusion that performers physically pass between real and virtual worlds. Live and video-based observations of Desert Rain, coupled with interviews with players and the production team, have revealed how the performers create conditions for the willing suspension of disbelief, and how they monitor and intervene in the player's experience without breaking their engagement. This involves carefully timed performances and "off-face" and "virtual" interventions. In turn, these are supported by the ability to monitor players' physical and virtual activity through asymmetric interfaces.