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Come for a walk with me to the musical instruments section of the Deutsches Museum in Munich. One of the exhibits is a set of - and I don't even know if there's a word for them in English, never mind in German - resonating pipes. Varying in length, they're a bit like a cross between the pipes on a church organ and an ear-trumpet. Put your ear to the aperture of one of the pipes, and it allows you to hear snippets of conversation from any of the visitors in the exhibition hall who just happens to be speaking on the particular frequency that the pipe is adjusted to. The longer the pipe, the deeper the voices it can pick up and vice versa. Move to the next pipe up or down the range, and the first voice disappears only to be replaced by that of someone talking at a higher or low frequency.
Recently I've been re-reading plays of Shakespeare that I studied at school.