Macbeth: Symbolism in Imagery In William Shakespeare’s Macbeth theme and imagery are hopelessly interwoven in an elaborate, intricate nature that only increases in complexity as the play progresses. Three central themes/recurring images in the play are those of blood, clothing and darkness. Only through careful examination of the images do the connections become evident and can understanding of their significance be achieved. The image of blood is by far the most frequently repeated in the play. Blood is used to great effect to stow the extent of the guilt felt by the Macbeths. In act I, scene 5 line 50 Lady Macbeth calls upon the dark spirits to “make thick” her blood