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It's an interesting experiment, but the author's conclusion cannot possibly follow from the results of it.

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.

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.

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.

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