ABSTRACT
The complexification of the psychic space is characterized by multidimensional development. The internal world is constituted by an internal groupality, sociality. It is inhabited by internal objects. The potentiality of an internal world, populated by animated objects maintaining a relational life, is dependent on the introjection of an optimal containing object that signifies the three-dimensional organization of the psychic space. The three-dimensionality of psychic space inaugurates the birth of thought.
