The Mechanics of Motion Sensing

"With a tilt of your wrists, the dragon you're riding dives toward the water below. With another movement of your hands, as if pulling back on imaginary reins, the scaly beast pulls out of the dive into level flight, flapping its wings.

That's how the unreleased game "Lair" will work on the Sony PlayStation 3, which launched in the U.S. on Friday. Like Nintendo Co.'s Wii console, which went on sale two days later, it uses a motion-sensitive controller in an effort to make games more intuitive to play.[...}

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