Dreams are the gateway to an inner world, a world just as real as the one outside. What is outside is also inside; what is inside is also outside. Dreams inform us in a visual language about repressed experiences and other process of the unconscious.  Dream images and activities, however strange and even meaningless they may seem, show symbolic structures. Scientific research into dreams, compared dream material with its symbolic content.  Dreams became psychotherapy's most important aid in exploration of the unconscious. A knowledge of the meaning of these symbols is of great assistance in the interpretation of dreams.