Miina Matsuoka lives by herself in New York City. She owns two cats and routinely screens her calls. But before you jump to conclusions, note that she is comfortable hobnobbing in any of five languages for her job as business manager at an international lighting-design firm. She just strongly prefers not to socialize, opting instead for long baths, DVDs, and immersion in her art projects. She does have good, close friends, and goes dancing about once a month, but afterward feels a strong need to “hide and recoup.” In our society, where extroverts make up three-quarters of the population, loners (except Henry David Thoreau) are pegged as creepy or pathetic. But soloists like Matsuoka can function just fine in the world—they simply prefer traveling through their own interior universe.