Dad records himself having a sweet moment with his daughter. Then she smelled his breath.

Have you ever watched a movie or read a book or listened to a piece of music and wondered, "How did they come up with that idea?" The creative process is so enigmatic even artists themselves don't always know where their ideas come from, so It's a treat when we get to hear the genesis of a brilliant idea straight from the horse's mouth. If you've watched "Wicked" and wondered where the idea for the friendship between Elphaba (the Wicked Witch) and Glinda (the Good Witch) came from, the author of the book has shared the precise moment it came to him.

The hit movie "Wicked" is based on the 20-year-old hit stage musical, which is based on the novel "Wicked: The Life and Times of the Wicked Witch of the West" written by Gregory Maguire. While the musical is a simplified version of the 1995 book, the basic storyline—the origins of the two witches from "The Wizard of Oz"—lies at the heart of both. In an interview with BBC, Maguire explained how Elphaba and Glinda's friendship popped into his head.

Maguire was visiting Beatrix Potter's farm in Cumbria, England, and thinking about "The Wizard of Oz," which he had loved as a child and thought could be an interesting basis for a story about evil.

"I thought 'alright, what do we know about 'The Wizard of Oz' from our memories,'" he said. "We have the house falling on the witch. What do we know about that witch? All we know about that witch is that she has feet. So I began to think about Glinda and the Wicked Witch of the West…

"There is one scene in the 1939 film where Billie Burke comes down looking all pink and fluffy, and Margaret Hamilton is all crawed and crabbed and she says something like, 'I might have known you'd be behind this, Glinda!' This was my memory, and I thought, now why is she using Glinda's first name? They have known each other. Maybe they've known each other for a long time. Maybe they went to college together. And I fell down onto the ground in the Lake District laughing at the thought that they had gone to college together."

In "Wicked," Glinda and the Wicked Witch, Elphaba, meet as students at Shiz University, a school of wizardry. They get placed as roommates, loathe each other at first, but eventually become best friends. The story grows a lot more complicated from there (and the novel goes darker than the stage play), but it's the character development of the two witches and their relationship with one another that force us to examine our ideas about good and evil.

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Maguire also shared with the Denver Center for Performing Arts what had inspired him to use the "Wizard of Oz" characters in the first place.

"I was living in London in the early 1990’s during the start of the Gulf War. I was interested to see how my own blood temperature chilled at reading a headline in the usually cautious British newspaper, the Times of London: 'Sadaam Hussein: The New Hitler?' I caught myself ready to have a fully formed political opinion about the Gulf War and the necessity of action against Sadaam Hussein on the basis of how that headline made me feel. The use of the word Hitler – what a word! What it evokes! When a few months later several young schoolboys kidnapped and killed a toddler, the British press paid much attention to the nature of the crime. I became interested in the nature of evil, and whether one really could be born bad. I considered briefly writing a novel about Hitler but discarded the notion due to my general discomfort with the reality of those times. But when I realized that nobody had ever written about the second most evil character in our collective American subconscious, the Wicked Witch of the West, I thought I had experienced a small moment of inspiration. Everybody in America knows who the Wicked Witch of the West is, but nobody really knows anything about her. There is more to her than meets the eye."

Authors and artists—and their ideas—help hold a mirror up to humanity for us to see and reflect on who we are, and "Wicked" is one of those stories that makes us take a hard look at what we're seeing in that mirror. Thanks, Gregory Maguire, for launching us on a collective journey that not only entertains but has the potential to change how we see one another.