" One of the reasons it works is that it creates a high-purpose environment by delivering an unbroken array of consistent little signals. Every time an officer banters with a fan, every time a fan notices the lack of protective armor, a signal is sent: We are here to get along. Every time the police allow fans to keep kicking the ball, they reinforce that signal. By themselves, none of the signals matter. Together they build a new story. "

― Daniel Coyle , The Culture Code: The Secrets of Highly Successful Groups