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21-Jan-2017 15:15

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.

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).

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?

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).

Yet participants’ performance was not improved even when they were given specific instructions to do so.