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. A dream of crossing the bridge into a foggy place is a nightmare that implies death and disability. If the place across the bridge is covered with strange flowers, it represents the afterlife.