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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.
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.
Management consultants in the 1970s and 1980s even used this puzzle when making sales pitches to prospective clients.
Because the solution is, in hindsight, deceptively simple, clients tended to admit they should have thought of it themselves.