Effugas writes: "Fark pointed me at this brilliantly elegant new invention, the Sonic Flashlight. From the curious workshop of George Stetten, an ultrasonic scan of the inside of a patient's body is visually overlaid perceptually within the body being scanned, with no requirement for special glasses, viewing angles, or even particularly exotic hardware. How? Form a triangle with an ultrasound platform and its output display--then bisect the triangle with a half transparent(see the body below), half reflective(see the display above) pane of glass. Since the angles match, the two images merge to provide a perfectly placed synthesis of reality and its augmentation, irrespective of viewer position. Watch the video here for a demonstration; note the hand held variant at the bottom of the page as well. Slick!"