"only one tenth of the mass of the iceberg is Visible above the surface of the water... The vast majority being hidden underneath." This phenomenon is not restricted to icebergs. "the iceberg model" is a look inside the head of a Man who, on the surface is confined in a restrictive Environment, and yet possesses immense potential Within his mind. it shows how eventually the external Pressures become so great that they throw his internal Thought world into chaos.