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Since the advent of broadcast television in the 1940s, Hollywood has continually introduced splashy new technologies meant to distinguish movies presented in theaters from entertainment viewed at home. Widescreen Cinerama, early attempts at 3-D and a chair-shaking audio format known as Sensurround (launched in 1974 for the movie Earthquake and abandoned in 1979) are just a few examples of the industry?s efforts to transform the filmgoing experience into a special event.?