Wizard of Oz Fact #75: The Emerald City Glasses Were a Clever Illusion
In the book, citizens of the Emerald City wear green‑tinted glasses to make everything appear emerald. The film kept the idea symbolically by giving the Wizard’s guards and attendants distinctive eyewear. This subtle nod to Baum’s original concept helped maintain the whimsical logic of Oz while adapting it for the screen.
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Source: Parade