Final answer:
Montag imagines the faces of the audience in gray because he sees them as lacking individuality and critical thinking. The gray color symbolizes conformity and numbness in a dystopian society.
Step-by-step explanation:
In the book Fahrenheit 451, the protagonist Montag imagines the faces of the audience as having gray colorless eyes, gray tongues, and gray thoughts because he sees them as being devoid of individuality and critical thinking. The gray color symbolizes conformity, uniformity, and lack of emotion or passion. Montag feels that the people in society have become numb and passive, consumed by mindless entertainment and disconnected from their own thoughts and feelings. By describing the audience in this way, the author highlights the dehumanizing effect of a dystopian society that suppresses free thinking and intellectual engagement.