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Acoustic location is the art and science of using sound to determine the distance and direction of something. Location can be done actively or passively, and can take place in gases (such as the atmosphere), liquids (such as water), and in solids (such as in the earth). "

"The German polymath and Jesuit priest Athanasius Kircher had a lifelong fascination with sound and devoted two books to the subject: Musurgia Universalis (1650), on the theoretical (and theological) aspects, and Phonurgia Nova (1673), on the science of acoustics and its practical applications. It's no surprise then to learn that his famed museum at Rome's Collegio Romano boasted- in addition to "vomiting statues", ghost-conjuring mirrors, and other curious wonders - a vast and diverse collection of musical instruments. "