American movies are in the midst of a transition period. Some directors place their trust in technology. Spielberg, who is a master of technology, trusts only story and character, and then uses everything else as a workman uses his tools. He makes “Minority Report” with the new technology; other directors seem to be trying to make their movies from it. This film is such a virtuoso high-wire act, daring so much, achieving it with such grace and skill. “Minority Report” reminds us why we go to the movies in the first place.