Learning to pass, it turns out, is less a matter of acting than acting. You can become part of a given scene, situation, or people (' ,' as it were), simply by letting yourself serve as a mirror for those around you. When I was still in college, when I still thought I might make a good priest, I spent some time in a Trappist monastery. I found that by exerting as little of my own personality as possible, I was able to fit right in. The monks in no time came to call me brother, believing I was destined to make vows as one of their own. Passing begins with the assumptions of those around you. The best thing you can do to maintain the illusion is to come as close as possible to doing nothing at all.