"That which cries, 'Thus must do' if thou have it; And that which rather though dost fear to do, Than wishes should be undone." -Lady Macbeth (Act 1. Scene 5.21-23) Lady Macbeth almost asks, what is worse, 'doing something bad and wish you hadn't'? Or to not do it and wish you had'? The imagery shows her in black and white, which suits her character very well, as well, as her personality is never clear. She also looks very mysterious above.