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(a) Creation of an acoustic shadow by an obstruction in the path of a sound wave; (b) absence of an acoustic shadow behind an obstruction when the sound wave is of low frequency (i.e. of a wavelength large relative to the size of the obstruction). Grove Music Online. Retrieved 15 Sep. 2019, from https://www.oxfordmusiconline.com/grovemusic/view/10.1093/gmo/9781561592630.001.0001/omo-9781561592630-e-8000000015.