I always suspected an N wrote Personality Page.
I'll place my INTJ description when I get my thoughts organized...
EDIT: Here it is.
The
INTJ is the
Mastermind not because he masterminds a plan to take over the world, as is much often stereotyped, he is the mastermind of any project he undertakes, be it an architectural masterpiece, an art project, an invention, a political movement, or whatever his vision is.
And vision is key for the INTJ, an Ni dominant. The INTJ is not called a scientist because he is necessarily scientific in thinking, he is a scientist because he approaches his vision strategically. The INTJ is often compelled to think outside of the box and challenge convention, and yet, the INTJ also often prefers things to be predictable. So while his life may seem boring and routine to the outsiders, the inside of an INTJ is filled with a wealth of subjective possibilities.
The INTJ is a person of complex visions and has an inner drive to express his abstract visions as concretely as possible. He is not interested in asking more questions, he wants his conceptions to be complete and unambiguous in the presence of others.
Unlike the INTP, the INTJ is not a logical type. Where the INTP filters external unknowns through internal logic, the INTJ merely uses the external world as a source for inspiration of a master plan, a new story idea, or a scientific insight.
Sometimes, the INTJ can be so wrapped up in internal concepts that they obsess over the idea and forget how to make it into a reality. Other times, they are so confident of their conceptions that they refuse to listen to alternative viewpoints, and so they often stubbornly resist changing their perceptions about things.
The vivid imagination of an Ni dominant such as the INTJ is the source of creative insight, but could also be the source of paranoia. Indeed, the INTJ can often imagine and be convinced of imaginary threats all around them. Also, the INTJ's desire to do things their way could also lead them to a desire to change other people to fit their idea of how the world should be. Indeed, you can call an INTJ stubborn and arrogant, but it is highly unlikely that the INTJ is going to care.