Final answer:
In addition to physical distance, functional distance, which includes the frequency and nature of interactions, is an important variable to consider in proximity related to relationship formation.
Step-by-step explanation:
When considering proximity in the context of forming relationships, in addition to physical distance, one must also consider functional distance. Functional distance refers to the frequency and nature of interactions individuals have with one another. This concept can be more influential than actual physical distance in determining with whom we form friendships or romantic relationships. For instance, two people living in the same building are more likely to interact and hence, have a greater functional distance, which could lead to a stronger relationship than with someone living further away.