" As you navigate the various zones with people, a variety of specific physical and psychological responses is elicited from them. Until you know someone, avoid invading his or her personal space. Getting closer gradually demonstrates that you like the other person. This gradual and comfortable approach begins the circle of rapport—he sees that you like him, he likes that you like him, and he reciprocates by liking you back. "

― Susan C. Young , The Art of Body Language: 8 Ways to Optimize Non-Verbal Communication for Positive Impact (The Art of First Impressions for Positive Impact, #3)