THE CIRCLES ARE EVERYWHERE, if you knowto look for them. They're on the whiteboardsaround Dan Harmon's office, on sheets tacked to his walls, on a notepad on the floor of his car. Each one is hand-drawn and divided into quadrants with scribbled notes and numbers sprouting along the edges. They look like little targets.Harmon, 38, is the creator of Community, a sitcom about a group of community-college study buddies and the most giddily experimental show on network TV. He began doodling the circles in the late '90s, while stuck on a screenplay. He wanted to codify the storytelling process—to find the hidden structure powering the movies and TV shows, even songs, he'd been absorbing since he was a kid. "I was thinking, there must be some symmetry to
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