How they recognize the postures is interesting, too -- "Given the similarity between a pressure distribution map from the contact sensors and a greyscale image, computer vision and pattern recognition algorithms, such as Principal Components Analysis, are applied to the problem of classifying steady-state sitting postures," says the article.
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bmongar writes: "An article at Eurekalert mentions that scientists at Purdue University have made a chair that can sense your posture and movement. As a sufferer of low back pain I hope this leads to chairs that can sense your posture and adjust to provide proper support for your back. It would be a possible relief for millions. I can't find the links supporting this, but I believe computer professionals suffer more back pain than professional movers." This is a cool project. This stuff -- furniture, and ergonomics in general -- will only get more important, even if it's still amazingly neglected.