What is the significance of each of the traits that Dorothy and her friends seek from the Wizard? In other words, why a brain, a heart, courage, and a home? Did these characters really need to seek a wizard’s help to find these things? Why or why not
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This is a pretty involved set of questions for this short forum space. I can comment that each trait represents a part of humanity. Each character realizes they never needed a wizard to attain this quality: they only needed to recognize it in themselves.