In an industrial park just outside Montreal, a company called D-BOX is adding an entirely new dimension to the home-theater experience. D-BOX has invented a technology that translates on-screen movement to motion in your viewing chair, adding a visceral thrill to movie watching. All you have to do is pop a DVD into any player, sit in a special D-BOX motion-simulation chair or in a conventional chair atop a D-BOX platform, and hang on for the ride.