Transparent gel speaker plays music through the magic of ionic conduction (video) Roel August 31, 2013 This could be useful for applications in thin-film organic user interfaces Source: http://www.engadget.com/2013/08/30/transparent-gel-speaker-ionic-conduction/?utm_medium=feed&utm_source=Feed_Classic&utm_campaign=Engadget&ncid=rss_semi