Loneliness, if only as representing a lack of communication, is recurrent through Lain. Lain herself (according to Anime Jump) is "almost painfully introverted with no friends to speak of at school, a snotty, condescending sister, a strangely apathetic mother, and a father who seems to want to care but is just too damn busy to give her much of his time". Friendships turn on the first rumor; and the only insert song of the series is named Kodoku no shigunaru, literally "signal of loneliness"
Communication, in its wider sense, is one of the main themes of the series, not only as opposed to loneliness, but also as a subject in itself. Writer Konaka said he wanted to directly "communicate human feelings". Director Nakamura wanted to show the audience - and particularly viewers between 14 and 15 - "the multidimensional wavelength of the existential self: the relationship between self and the world".
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