Highly recommend this essay, new at Evening Will Come. Joron talks theremin, "dreamweapons," and Rossetti's "Monochord."
Imagine the speech-sphere turned inside out: its center—its source in sound—becomes its outer surface. Its new center is a vanishing point into which meaning recedes and finally disappears. All that remains is the exteriority of sound. One sound––miraculously, it also happens to be a word—now covers the entirety of language. That word is susurrus. It is similar, perhaps identical, to the “hum of the Earth.”