Art works speak not only to their own time but to worlds beyond, to future generations, to a mass society connected by international communications that their creators could not suspect would ever come into being.
Hello, Taka! I'd say it refers either to "international communications" (the nearest to "that"), or to the whole, from "worlds beyond" to "international communications" (the creators couldn't imagine any of them ever coming into being).
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DavkettWhat do you do for making a living, Taka?