Metaphor is an interpretation of the inner space and an expression of imagination. It can not be easily classified as a state of mind with shapes, like feelings, the poetic, time, the conceptual, and the non-visual. It is free imagination which releases the consciousness and explores the world of sub-consciousness. It is a specific state concealing under a hidden space. By covering the inner, certain details will be concealed and simplified. It can be appreciated from an abstract aesthetic point of view.