The Group-Analytic situation thus produces an everlasting flow of unexpected and undefined material, as provided by the participants' own spontaneous and undirected contributions. In this respect it is similar to a projection test, like the Rorschach or T.A.T., only that the material is alive and multidimensional. The material brought forth, precisely because of its incompleteness, is open to manifold interpretations, stimulates each participant's own personal complexities to become fully engaged in the process. The group-analytic situation, however, at the same time produces an ever-changing scene of action and reaction, a kind of sociodramatic situation between living persons, in which each participant has to engage and extend his whole personality, a personality in action, if he is to participate.