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Because the solution is, in hindsight, deceptively simple, clients tended to admit they should have thought of it themselves.Because they hadn’t, they were obviously not as creative or smart as they had previously thought, and needed to call in creative experts. The nine-dot puzzle and the phrase “thinking outside the box” became metaphors for creativity and spread like wildfire in marketing, management, psychology, the creative arts, engineering, and personal improvement circles.The first group was given the same instructions as the participants in Guilford’s experiment.The second group was told that the solution required the lines to be drawn outside the imaginary box bordering the dot array.In other words, the “trick” was revealed in advance.Would you like to guess the percentage of the participants in the second group who solved the puzzle correctly?Most people assume that 60 percent to 90 percent of the group given the clue would solve the puzzle easily. What’s more, in statistical terms, this 5 percent improvement over the subjects of Guilford’s original study is insignificant.
Both teams followed the same protocol of dividing participants into two groups.Yet participants’ performance was not improved even when they were given specific instructions to do so.That is, direct and explicit instructions to think outside the box did not help.The symmetry, the beautiful simplicity of the solution, and the fact that 80 percent of the participants were effectively blinded by the boundaries of the square led Guilford and the readers of his books to leap to the sweeping conclusion that creativity requires you to go outside the box.The idea went viral (via 1970s-era media and word of mouth, of course).