" It didn't work," said the King. "The cloak of invisibility didn't work."
"Yes, it did," said the Royal Wizard.
"No, it didn't," said the King. "I kept bumping into things, the same as ever."
"The cloak is supposed to make you invisible," said the Royal Wizard. "It is not supposed to keep you from bumping into things."
"All I know is, I kept bumping into things," said the King. "

― James Thurber , Many Moons