In the 1970s, however, very few were even aware of its existence, even though it had been around for almost a century.
If you have tried solving this puzzle, you can confirm that your first attempts usually involve sketching lines inside the imaginary square.
The correct solution, however, requires you to draw lines that extend beyond the area defined by the dots.
At the first stages, all the participants in Guilford’s original study censored their own thinking by limiting the possible solutions to those within the imaginary square (even those who eventually solved the puzzle).
Let’s look a little more closely at these surprising results.
Solving this problem requires people to literally think outside the box.
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.
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).
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He challenged research subjects to connect all nine dots using just four straight lines without lifting their pencils from the page.