To change perspective is to alter your view point - to see things in a different way.
The novel "Veronika Decides to Die" by Paulo Coelho and the song "Both Sides, Now" by Joni Mitchell are both examples of changing perspective.
In Coelho's novel, the protagonist Veronika moves from feeling suicidal and disillusioned about life and love, believing that "her existence had no meaning" to seeing "each day a miracle" and falling passionately in love.
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is exactly what she experienced when she saw things from an idealistic viewpoint, creating in the responder an effective understanding of her experience.
The intended audience is probably a mature one, as Mitchell reflects on her idealism and her disillusionment, "I've looked at life from both sides now" she repeats. Younger people might not relate to these themes. The song explores how one thing can be seen in dramatically different ways when one's perspective changes.