Or so their consultants would have them believe. It is an opportunity for us to reflect on the language and ideas that represented each year. Management consultants in the s and s even used this puzzle when making sales pitches to prospective clients. That is, direct and explicit instructions to think outside the box did not help. In other words, the difference could easily be due to what statisticians call sampling error. The second group was told that the solution required the lines to be drawn outside the imaginary box bordering the dot array. They are much more common than you probably think.