How do mirrors help to create a feeling of disorientation in film noir?

One of the techniques used was the low-key lighting which causes the effect of obscuring the action, and deglamourizing the star so that the composition becomes more important than the actor. Earlier American movies had focused on the star. The use of night and shadows emphasizes the cold and the darkness in the noirs. The change of focus from the actors and movement in the image to the compository excitement underline a fatalistic and hopeless mood. This mood is also fortified through a complex narration, often disjuncted and fragmented. To do this flashbacks are often used, which emphasizes the feeling of lost time and despair. According to Paul Schrader time is manipulated because the form stands above the content. In the narration voice-over is also often used , and in connection we sometimes get to see the end of the film in its beginning. This is also an unconventional use of the time notion that call forth a feeling of predestination and irrevocable past.

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including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.