The relationships between individuals, especially those who played a role in the life of a place, have always been significant for research. Not only "because man exists and lives in communion with his fellow man," but because the relationship between individuals signifies a meeting, which manifests as a mutual embedding.

Thus, it is a distortion of ideas, concerns, trends, purposes, struggles, but also of contrasts and disagreements, and therefore a composition of existences, sometimes also a complementarity.