The document discusses the use of imagery in Shakespeare's play Macbeth. It notes that imagery related to blood and violence increases throughout the play, reflecting the increasing murders and violence. References to blood are used to set the tone of scenes and characterize death. Imagery of blood is prominent after each murder and peaks with Lady Macbeth's hallucinations of blood on her hands. Other imagery like references to animals and plants is also used. Overall, the extensive use of imagery, especially that related to blood, is important in moving the plot forward and setting the dark, violent tone of the play.