What theme of fahrenheit 451 does the title of granger's book hint at?

The title of Granger's book is The Finger in the Glove: the Proper Relationship between the Individual and Society.

This hints at a major theme of the novel: that of the individual's role in society. The individual is just a finger in the "glove" of society. The individual is only a small part of society and is necessary to "fill" it. The glove, or society, is the outer shell presented to the world.

Furthermore, just as gloves protect fingers, so too does society protect the individual. This "protection" can take a negative turn, as when censorship is used.