Wizard of Oz most are familiar with is a remake of an older movie. The color version introduced the viewing audience to color video.
The yellow brick road led to the Emerald city where all was to be perfect. It ended up being a farce run by a man using smoke and mirror parlor tricks.
The Emerald city was symbolism to the Emerald tablets to discredit them. Very deep rabbit hole.
Current beliefs put the Emerald tablets as a farce propagated by wizards using smoke and mirrors.
If the Emerald tablets were true then religions would be the ones with the smoke and mirror wizards.