A silly applet I put together, that rings an alarm when you are slouching in front of your computer screen. Using an OpenCV library in Processing I could do face detection through the webcam and thereby measuring the distance between your head and the computer (if you have a laptop with a webcam on top of the screen, that is.)
It is superbuggy, but for me not being a programmer and spending around three hours on I think it works okay.

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