1) Personal space and use of space varies across cultures, with some cultures preferring closer physical distances in conversation and interaction than others.
2) Edward Hall developed the concept of proxemics to study how different cultures use personal space and territoriality. There are different zones of social distance, from intimate to public, with unwritten rules about proximity for different types of interactions.
3) Cultural norms around personal space and territoriality can depend on climate, with colder northern cultures typically preferring more physical distance than warm weather Mediterranean cultures. Reactions to perceived invasions of territorial space also vary cross-culturally.