It's sort of analogous to the difference between Keirsey's pairings of Guardian/Idealist and Artisan/Rational. Guardians/Idealists tend to be "cooperative" in

It's sort of analogous to the difference between Keirsey's pairings of Guardian/Idealist and Artisan/Rational. Guardians/Idealists tend to be "cooperative" in their use of tools, meaning that they consider how other people and society might use the tool. So they might avoid stressing a crowbar to breakage unless it's to suit the needs of their group. They might also be unlikely to bend playing cards that they don't own. Artisans/Rationals tend to be more "utilitarian" in their use of tools, meaning that they will subvert a tool if it suits them. So they might use a finish hammer to chip rocks if they have nothing else available, even if it's your finish hammer and you really needed it to put up casing next week. It's interesting to note that he considers language a tool, and so their use of language may follow similar patterns. There are some parallels with Meyers-Briggs in his system, although his intent was to provide measurable characteristics rather than statements about someone's mind.