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Overnight, it seemed that creativity gurus everywhere were teaching managers how to think outside the box.Management consultants in the 1970s and 1980s even used this puzzle when making sales pitches to prospective clients.

Both teams followed the same protocol of dividing participants into two groups.

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.

In other words, the difference could easily be due to what statisticians call sampling error.

Even though they weren’t instructed to restrain themselves from considering such a solution, they were unable to “see” the white space beyond the square’s boundaries.

Only 20 percent managed to break out of the illusory confinement and continue their lines in the white space surrounding the dots.

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