What are these free traits? They're where we enact a script in order to advance a core project in our lives. And they are what matters. Don't ask people what type you are; ask them, "What are your core projects in your life?" And we enact those free traits. I'm an introvert, but I have a core project, which is to profess. I'm a professor. And I adore my students, and I adore my field. And I can't wait to tell them about what's new, what's exciting, what I can't wait to tell them about. And so I act in an extroverted way, because at eight in the morning, the students need a little bit of humor, a little bit of engagement to keep them going in arduous days of study.