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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.
Today many people are familiar with this puzzle and its solution.
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.
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.
it only proved that telling someone to 'think out side the box' is, in most cases, ineffective.
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?
Let’s look a little more closely at these surprising results.
Solving this problem requires people to literally think outside the box.