What is the theme of "There Will Come Soft Rains"?
One of the themes of the story is the fundamentally inhuman nature of technology. The automated house was originally built to cater for the family's every need. Yet in the wake of a nuclear apocalypse it still goes on, performing its functions despite the complete absence of any humans. On this reading, technology has a life of its own; though created by humans, it is able to operate without them.
This presents us with the scary picture, familiar from countless sci-fi stories and films, of technology as a kind of Frankenstein's monster, that eventually ends up dominating and controlling human life. Such power, as displayed by the automated house, was doubtless much in evidence before the nuclear explosion, but it is even more so now that humanity has been wiped out.
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