Metaphors of sound of thunder

 "It closed its mouth in a death grin." Metaphors is the transference of a 'quality' from one thing to another.The sound of thunder uses metaphors brilliantly to describe the story in more detail. Time was a film run backward."  The quality of film running backwards  is being transferred to time.It closed its mouth in a death grin. The quality of the  death grin is transferred to the t-Rex . Eckels felt his eyelids blink over his stare, and the sign burned in this momentary darkness. The quality of the that is being transferred is the visual quality of the brightness of the the fire ' burning the sign in his brain' The author uses metaphors to explain things in more detail without writing to much.