And in her ears the little Seashells, the thimble radios tamped tight, and an electronic ocean of sound, of music and talk and music and talk coming in, coming in on the shore of her unsleeping mind. The room was indeed empty. Every night the waves came in and bore her off on their great tides of sound, floating her, wide-eyed, toward morning. (10)
Ocean is vast, massive --> idea of how sound overwhelms Mildred --> used to hypnotise and distract her
Waves came in and bore her off on their great tides of sound --> as if Montag is standing on a beach and the waves are carrying mildred away from the shore --> increasing the distance between Montag and Mildred --> into the vastness of the ocean --> very large
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Hypnotic -> long first line --> polysyndeton "electronic ocean of sound, of music and talk and music and talk coming in, coming in on the shore of her unsleeping mind."