Personal Statement
People walk up is a kind of conduct that serves people's basic instincts, desires and sub-consciousness, and has almost no need for rational judgment. The desire to ascend is always without a clear aim. In this process, limbs act in large anticipation to the brain.
Water flows down, is the result of a rational judgment and recognition of people's objectives. The recognition of water's running deep may induce people's rational behavior, for example, how to utilize, how to control and how to dispose of water.