We all have varying definitions of what our “personal space” is, and these definitions are contextual and depend on the situation and the relationship. Although our bubbles are invisible, people are socialized into the norms of personal space within their cultural group. Scholars have identified four zones for US Americans, which are public, social, personal, and intimate distance. Edward T. Hall, “Proxemics,” Current Anthropology 9, no. 2 (1968): 83–95. The zones are more elliptical than circular, taking up more space in our front, where our line of sight is, than at our side or back where we can’t monitor what people are doing. You can see how these zones relate to each other and to the individual in Figure 4.1 "Proxemic Zones of Personal Space". Even within a particular zone, interactions may differ depending on whether someone is in the outer or inner part of the zone.
Figure 4.1 Proxemic Zones of Personal Space