Zhang Yimou, director of the sumptuous martial-arts movie "Hero," feels the world needs chivalry, romance and vibrant natural beauty now more than ever before. "The more developed society becomes, the more industrialized it becomes and the more people long for these types of characters and this type of world," says Zhang, who delivers another healthy dose of fantasy this Friday with "House of Flying Daggers," a martial-arts epic about three warriors torn between love and their political allegiances. "Amid the social pressures that we are living under, there is less and less freedom and more and more rules to abide by," Zhang continues, through an interpreter. "We increasingly crave that...