I desperately need a poem on 'changing perspective', though none by Robert Frost because we've already analysed them in class. =)

Maybe the lyrics to 'The Boy Named Sue', by Shel Silverstein

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Or this one by A.E.Housman:

When I was one-and-twenty
    I heard a wise man say,
"Give crowns and pounds and guineas
    But not your heart away;
Give pearls away and rubies
    But keep your fancy free."
But I was one-and-twenty,
    No use to talk to me.

When I was one-and-twenty
    I heard him say again,
"The heart out of the bosom
    Was never given in vain;
'Tis paid with sighs a plenty
    And sold for endless rue."
And I am two-and-twenty,
    And oh, 'tis true, 'tis true.