Directly from ftp://ftp.research.microsoft.com/pub/tr/TR-2008-57.pdf
Interesting...
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We propose a new type of input for mobile devices by sensing forces such as twisting and bending applied by us-ers. Deformation of the devices is not necessary for such “force gestures” to be detectable. Our prototype implemen-tation augments an ultra-mobile PC (UMPC) to detect twisting and bending forces. We detail example interac-tions using these forces, employing twisting to perform application switching (alt-tab) and interpreting bending as page-down/up. By providing visual feedback related to the force type applied, e.g. of an application window twisting in 3D to reveal another and of pages bending across, these force-based interactions are made easy to learn and use. We also present a user study exploring users’ abilities to apply forces to various degrees, and draw implications from this study for future force-based interfaces.
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