Why don't you think about "boundaries"?
What is the boundary between you and everyone else? The boundary between the body, the boundary between consciousness, values, personal space, and possessions. What is your standard for drawing the line between "this" and "that"? We unconsciously draw these lines on a daily basis. However, we must not forget that these standards are not shared. Make sure that what you take for granted does not unconsciously infringe on the rights of others, and that your rights are not infringed by what others take for granted.