29/03/2023
In the children's book "The Wonderful Wizard of Oz" by Frank L Baum, the citizens of Emerald City are compelled from birth to death to wear green goggles over their eyes. The city is made of plain white stone and it only appears as emerald because of the world which has been pulled over their eyes.
When it gets to the movie the Wizard of Oz, it seems designed like some joke by those who read the book because the people staring at the movie screen watching this brand new technicolor extravaganza are kept blissfully unaware that the city isn't made of emeralds at all.