XIR207681 Echo Formation, illustration from \'Musurgia Universalis\', Vol II, fol.264, Iconismus XV, by Athanasius Kircher, first published in Rome in 1650 (engraving) by French School, (17th century); Private Collection; (add.info.: Athanasius Kircher (1602-80) German Jesuit scholar and polymath; his \'Musurgia Universalis\' is a seminal work of musicology, published in Rome in 2 volumes in 1650 and was very influential in the development of Western music, especially influencing J.S. Bach (1685-1750) and Beethoven (1770-1827); ); French, out of copyright.