Nikolaos  Unalome said. “Sound can unblock deep emotions and induce a profound level of relaxation.” Laid out in a room were musical instruments handcrafted by specialist artisans in Poland, including bilas, “flat bells,” sheets of polished bronze that are struck by mallets, and “singing birds,” a set of 21 small metal disks that make a sound, he explained, “as if a flock of birds were singing while flying over space.”
 

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https://www.smithsonianmag.com/travel/thrills-rediscovering-ancient-greece-touring-modern-athens-180983972/