"Why hasn't anybody seen a mermaid and lived?" asked Trot again. "'Cause mermaids is fairies, an' ain't meant to be seen by us mortal folk," replied … - L. Frank Baum

"Make them read that it is no longer the fashion to wear birds upon hats. That will afford relief to your poor milliner and at the same time set free thousands of our darling birds who have been so cruelly used." Popopo thanked the wise king and followed his advice. The office of every newspaper and magazine in the city was visited by the knook, and then he went to other cities, until there was not a publication in the land that had not a "new fashion note" in its pages. Sometimes Popopo enchanted the types, so that whoever read the print would see only what the knook wished them to. Sometimes he called upon the busy editors and befuddled their brains until they wrote exactly what he wanted them to. Mortals seldom know how greatly they are influenced by fairies, knooks and ryls, who often put thoughts into their heads that only the wise little immortals could have conceived. The following morning when the poor milliner looked over her newspaper she was overjoyed to read that "no woman could now wear a bird upon her hat and be in style, for the newest fashion required only ribbons and laces."

To 'know Thyself' is considered quite an accomplishment.

The Scarecrow was now the ruler of the Emerald City, and although he was not a Wizard the people were proud of him. "For," they said, "there is not another city in all the world that is ruled by a stuffed man." And, so far as they knew, they were quite right.