The image as a mediator in individual therapy and in group sessions provides the occasion to mobilise the primary process of the unconscious, in a movement of regression necessary to any initial visualisation. Starting with this type of visualisation, it is possible to reach an authentic process of symbolisation. By “symbolisation”, I mean the process of connecting primary and secondary processes through “tertiary (intermediary) processes”, as André Green has defined them. Thinking in images favours this liaison through the use of a mediating image which condenses within itself the image of the subject and of the group. Some images presented in the group exemplify this function.