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In the 1970s, however, very few were even aware of its existence, even though it had been around for almost a century.

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.

No one, that is, before two different research teams—Clarke Burnham with Kenneth Davis, and Joseph Alba with Robert Weisberg—ran another experiment using the same puzzle but a different research procedure.

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

In other words, the “trick” was revealed in advance.

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