Returning to the Emerald City, they see the Wizard (now a booming voice that seems to come from the very air). He reneges on his promise, and the Lion knocks over a screen in anger. Behind it stands a bewildered man who claims to be the Wizard. He shows them the elaborate mechanical effects used to create his illusions, and tells them that he is really a balloonist from Omaha named Herman Smith who traveled to Oz by accident when his hot air balloon drifted off course. The Ozians had never seen such a sight and proclaimed him Wizard. Not wanting to disappoint them, he assumed the role and had a great city built. He then had everyone in it wear green glasses, and in time, they came to believe it was green.