Acoustic jar
Ceramic vessels found set into the walls of medieval churches. / From Wikipedia, the free encyclopedia
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An acoustic jar, also known by the Greek name echea (ηχεία, literally echoers), or sounding vases, are ceramic vessels found set into the walls, ceilings, and sometimes floors, of medieval churches. They are believed to have been intended to improve the sound of singing, [1][2] and to have been inspired by the theories of Vitruvius. They were supposedly used in ancient Greek theaters to enhance the voices of performers, though no archaeological evidence has been found.