A bridge is a medium that connects a situation to another. Crossing the bridge will change the environment and situation. For example, a connection process that changes from a healthy life to a sick patient, from life to death, from consciousness to unconsciousness, to a state of perception is a dream about legs. Especially in the precognitive dream, the bridge is a typical symbol of the boundary between life and death. In the dream of crossing a bridge across a dangerous valley with rapids, the bridge represents a serious danger that one will face in the future. In other words, the symbol of rapids is the key to interpreting this dream.