Forget about the myth of the solitary genius: collaborative effort generates ideas and inventions, says this useful, upbeat book about how innovation always emerges from a series of sparks—never a single flash of insight.

Judiciously wielding exercises and dozens of examples, Sawyer (Explaining Creativity) helps the reader understand how people think and function in and out of groups.

He looks at how J.R.R. Tolkien and C.S. Lewis composed their epic novels in concert, how unorganized individuals can come together to provide disaster relief more efficiently than government planners, how Charles Darwin and Samuel Morse built their work on others' discoveries, how information sharing helped Silicon Valley beat out Boston's computer startups.

Basing much of his work on that of mentor Mihaly Csikszentmihalyi—who writes about reaching the state of heightened consciousness he calls flow—Sawyer offers guidelines for creating group flow. Insisting that collaborative webs are more important than creative people, he calls for an organizational culture that fosters equivocality, improvised innovation, and constant conversation—that's a recipe for group genius.

Even if few readers are in a position to do away with their organizational chart, this is a solid recipe for unexpected innovation.