Issues and Strategies of Rhythmicality for MotionComposer

The paper discusses issues of rhythmicality in the MotionComposer, a therapy device for persons with different abilities that turns movement into music using video-based motion tracking. Aiming at both a low entry fee, and that the result should be rhythmical enough to induce further movement, the design of the device faces an inherent challenge, namely that since users are both dancing to the beat of the music, and creating it at same time, then they must be rhythmic enough in their movements to produce a satisfying result, or the feedback loop will break down. In addressing the problem, we apply a number of strategies named triggering, accenting and adaptive. This paper discusses the pros and cons of the various approaches, referring to experiences gathered in the field, and concludes by summarizing possibilities for improvements in the next version of the device.