On a whim, I just took a simple online test here meant to show how extroverted or introverted I am. The test told me that I am an “ambivert,” which lies in the middle of the two. This is not the first time I’ve heard this. Over the years I’ve thought a lot about my own personality, and not just in the extroversion-introversion sense. For awhile I was very interested in the enneagram, which describes nine different categories of personality (if you’re curious, I’m a six with a seven wing).…