They are the supreme pragmatists, who see reality as something which is quite arbitrary and made up.
Reality is quite malleable and can be changed, conquered, or brought to heel.
Reality is a crucible for the refining of ideas, and in this sense, INTJs are the most theoretical of all the types. Where an ESTP sees ideas as the pawn of reality, an INTJ sees reality as the pawn of ideas. No idea is too far-fetched to be entertained. INTJs are natural brainstormers, always open to new concepts and, in fact, agressively seeking them. INTJs manipulate the world of theory as if on a gigantic chess board, always seeking strategies and tactics that have high payoff.