The Wizard of Oz's true identity is a small man behind a curtain, a lost itinerant balloonist.
In chapters 15-19 of The Wonderful Wizard of Oz, the real identity of Oz is revealed to be a small man behind a curtain who was a lost itinerant balloonist declared a Wizard by the people in Oz. This revelation contrasts the grand illusion of the mighty Oz with the truth of a mere mortal creating a facade of power.
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