Google's offbeat view-master-like device stereo viewer consists of cardboard, lenses, a magnet, and washer pair—used as a control switch to trip the gate magnetometer used as a compass in most recent, modern smartphones, and a smartphone. The idea is your smartphone shows two stereo images, the lenses deliver an appropriate image to your eyes, and your brain sees a stereo image. The device is strapped to your head (or held to your head in your hands) and as you look around, the smartphone accelerometers and gyroscopes track your head motion to modify the images, so you walk though a virtual reality space (which may even be from stereo images of the real world, say, a museum. The developers of the Oculus Rift VR goggles aren't worried by the low quality, but we amateurs can start playing with VR for $10 or less, which is pretty cool.

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