The document discusses how silhouettes are used throughout the graphic novel Watchmen. Silhouettes of people's shadows being burned onto walls from the heat and light of nuclear bombs represent the inevitable death and disaster of nuclear war. They also remind characters like Rorschach of traumatic past events and create tension. However, silhouettes also represent humanity's desire to overcome isolation and unite in the face of an imminent threat like nuclear war. Overall, silhouettes are a common motif that evoke emotions while commenting on themes of fear, unity, love, and the relationship between past and future.