What is the contrast between Mildred and Clarisse in the book Fahrenheit 451?

Clarisse McClellan is a "thinker" and questions the society she lives in. She notices and watches everything around her. She notices things like how people have turned into "robots" and do not notice once found beauties such as flowers or grass. She wants to differ from everyone around her.

Mildred Montag has fallen into the lifeless mass culture. She thinks the people on the television are her family and addresses them as such. As soon as she learns Guy Montag is hiding books, she reports her own husband. She wants to be like all of the others.