At the beginning of Part 3, Beatty tells Montag that he, Montag, "wanted to fly near the sun and now . . . he's burnt his damn wings." This is a metaphor which alludes to the Greek myth of Icarus. Icarus and his father, Daedalus, built wings out of wax, but Icarus flew too close to the sun, and the wings melted. Beatty uses this metaphor here to suggest that Montag's attempts to defy the authoritarian state were just as foolish as Icarus' attempts to fly up to the sun. Both Icarus and Montag, Beatty implies, suffered because of their foolish attempts.
In the same passage, Montag is still somewhat in a state of shock. In reply to Beatty's admonishments, Montag feels his head "turn like a stone carving to the dark place next door." This simile suggests that Montag feels numb and shocked. It is at this point in the story that Montag realizes that it was Mildred, to whose "dark place" he turns his gaze, who called the alarm.
Later in part 3, Montag aims a flame-thrower at Beatty and fires....
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