Darkness; Beacon of Chaos in Macbeth Darkness in our society is indicative of evil. For instance, a black cat, a dark night, and a dark place are all symbolic of diablerie. Authors use these symbols to describe an evil character or setting. William Shakespeare employs the imagery of darkness in Act 4 of his play Macbeth to describe the agents of disorder. The witches, Macbeth, and Scotland are all described as dark because they represent the agents of chaos. The witches in the first scene of Act 4 are depicted as agents of chaos because of the dark domain around them. The witches meet in a dark cave. The cave is an appropriate setting