I am the Guardian of the Gates, and since you demand to see the Great Wizard of Oz I must take you to his Palace in the Emerald City. But first you must put on the Green Glasses." He opened the big box, and Dorothy saw that it was filled with spectacles of every size and shape. All were Green Glasses. Special emerald green lenses mounted in green frames. Great for your next production of the Wizard of OZ. "Those who enter the Emerald City must wear green glasses".