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The comfortable space between you and someone you know well will probably be much smaller than it would be if you barely knew the other person. With a stranger, it is even greater. Typically, people who live in crowded cities have smaller personal space preferences.
It's tricky. Regardless of our personal space preferences, we have to go outside sometimes. There, we are pressed against people we don't know – in lifts, on the footpath or on public transport.