Sigmund Fred once described subconciousness as iceberg: the part floating above we can see is consciousness, and the huge part which is hiding beneath sea horizon invisibly is subconciousness.

• 弗洛伊德曾用海上冰山来形容：浮在海平面可以看得见的一角，是意识，而隐藏在海平面以下，看不见的更广大的冰山主体便是潜意识。