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We present DynaSpot, a new technique for acquiring targets based on the area cursor. DynaSpot couples the cursor's activation area with its speed, behaving like a point cursor at low speed or when motionless. This technique minimizes visual distraction and allows pointing anywhere in empty space without requiring an explicit mode switch, thus enabling users to perform common interactions such as region selections seamlessly. The results of our controlled experiments show that the performance of DynaSpot can be modeled by Fitts' law, and that DynaSpot significantly outperforms the point cursor and achieves, in most conditions, the same level of performance as one of the most promising techniques to date, the Bubble cursor.

This paper describes the design and early evaluation of the Tangicam, or tangible camera, a mobile device for children to capture and edit realistic pictures and videos. Our first experimental results show that the affordances of the Tangicam allow imitation learning and free playing in a context of tangible and augmented reality. Our goal is to create a simple and robust observation system that lets children produce narratives based on situated [51] video, audio and sensor data. We also want to explore how these temporal structures may allow children to describe themselves, other children or natural phenomena and how such situated time series may help develop new forms of synaesthetic and intersubjective constructions.

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