The change toward larger Gestalten and the necessity of this change for both humanistic and formal reasons can be illustrated by considering Sullivan's emphasis upon the phenomena of interaction. This emphasis is very clearly part of a defense of man against the older, more mechanistic thinking which saw him so heavily determined by his internal psychological structure that he could easily be manipulated by pressing the appropriate buttons - a doctrine which made the therapeutic interview into a one-way process with the patient in a relatively passive role. The Sullivanian doctrine places the therapeutic interview on a human level, defining it as a significant meeting between two human beings. The role of the therapist is no longer to be dehumanized in terms of definable purposes which he can plan, and the role of the patient is no longer dehumanized into that of an object of manipulation.