We present a study and reflection about the role and use of smartphone technology for a large-scale musical performance involving audience participation. We evaluated a full design and development process from initial ideation to a final performance concept. We found that the smartphone became the design tool, the technical device and the musical instrument at the same time. As a technical device that uses ultrasound communication as interaction technique, the smartphone became inspirational for the artist's creative work. In aiming to support the artist, we observed pervasive importance of retaining artistic control to realise artistic intent. This concerns the co-design process and the resulting concept of audience participation and supports recommendations for such participatory work.

Tactile reliefs offer many benefits over the more classic raised line drawings or tactile diagrams, as depth, 3D shape, and surface textures are directly perceivable. Although often created for blind and visually impaired (BVI) people, a wider range of people may benefit from such multimodal material. However, some reliefs are still difficult to understand without proper guidance or accompanying verbal descriptions, hindering autonomous exploration. In this work, we present a gesture-controlled interactive audio guide (IAG) based on recent low-cost depth cameras that can be operated directly with the hands on relief surfaces during tactile exploration. The interactively explorable, location-dependent verbal and captioned descriptions promise rapid tactile accessibility to 2.5D spatial information in a home or education setting, to online resources, or as a kiosk installation at public places. We present a working prototype, discuss design decisions, and present the results of two evaluation studies: the first with 13 BVI test users and the second follow-up study with 14 test users across a wide range of people with differences and difficulties associated with perception, memory, cognition, and communication. The participant-led research method of this latter study prompted new, significant and innovative developments. CCS Concepts: • Human-centered computing → User studies; Gestural input; Accessibility systems and tools; Auditory feedback; • Applied computing → Fine arts;

Abstract. Healthcare benefited greatly from the trend of self-quantification. However, emotional states and psychological health are more elusive and defy description by simple sensor data. In this paper we show how a user oriented design process resulted in ZENse, a wearable prototype for digitally supporting ideas of Positive Psychology, a psychological approach to help patients with mental disorders. A conducted user study shows promising results on the idea and the design. Despite it being only a small explorative study with healthy participants, we found that the prototype triggers situations and interactions that are known to have a beneficial effect on mental well-being.

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