Which theory believes that human mind is mostly hidden like an iceberg and has three levels of consciousness?

According to Freud the human mind is like an iceberg. It is mostly hidden in the unconscious. He believed that the conscious level of the mind was similar to the tip of the iceberg which could be seen, but the unconscious was mysterious and was hidden. The unconscious also consists of aspects of personality of which a person is unaware. The conscious on the other hand is that which is within our awareness. The preconscious consists of that which is not in immediate awareness but is easily accessible. Sigmund Freud gave the concept of the Id, Ego, and Super Ego play in relation to conscious and unconscious thought. This thought usually represented by the Iceberg Model.