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The description of the elaborative unconscious ego is analysed in relation to the work of Freud and Bion. The heuristic dimension is illustrated by the dreams of patients of the rapporteur Michèle Van Lysebeth-Ledent. They follow the occurrence, in the analyst, of random incidents, in particular on the occasion of separations. This research has its place in a con-temporary psychoanalytic current that emphasises the non-linearity of the processes and the self-organising faculties of the psyche. An imbrication results, creating something new, be-tween the discoveries of the pioneers and the original contributions based on the notion of complexity, which was unknown to Freud at the moment of the dawn of psychoanalysis. Nov-elty and traditions are thus seen as entangled.