Even though metaphors for teaching abound, there's always room for another, and Kim Paffenroth presents a novel one—Glinda, the Good Witch of the North in The Wizard of Oz. He starts by ruling out the other characters in this much-loved tale. Dorothy is the student along with peer learners Scarecrow, Tin Man, and the Lion. They encounter the Wicked Witch of the West who's good at discipline, giving orders, and enforcing them. Paffenroth notes that those characteristics can be seen in some teachers, and they're not inherently wicked, but they're not what make master teachers.
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