The necessity of structures, especially for meaning, occurs after the initial separation of individuals from the unity of reality. Lacan used the dynamics of the family to describe this separation, with the developing child growing apart from the total nurturing of the mother and having to resort to the structure imposed by the father in order to relate to the mother. Heidegger described the structure of existence as a process of elements of reality hidden or revealed for individuals. The attempt to reunite with reality requires structures that order this reality through inclusion and exclusion in a way that is very different from the initial non-conscious unity with reality.