The switch in the narration emphasizes the contrast between Nero's high opinion of his musical ability and the opinion of a competent observer. Despite Policles's forceful manner, we value his viewpoint because he is passionate about music, a gifted singer, and doesn’t realize Nero is the emperor. When the narration follows Policles, we see how repulsive Nero is as a singer and a person. The narration emphasizes how unjust and ridiculous the contest was and shows that power matters most under many circumstances.
When the narration follows Nero and Platus, we get a glimpse of Nero's extreme conceit. We're also left with a sense that it would be impossible for anyone to change his opinion. Instead, the people around Nero make extraordinary efforts to pretend they share his inaccurate views. This view of Nero and Platus reveals another theme of the story: people can irrationally justify almost anything. Also, this narrative view supports the audience’s false applause for Nero as well as Policles's chaotic escape.
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Technology can be an indicator of when a story is set. Using knowledge on human technological advances can allow the viewer/reader to pick up “clues” from the visuals. This is a way to find out the time period of a cinematic piece.