 Written between 2007 and 2010 as a commentary focused on his opera "Die Jagd" (2008) and the orchestral piece "Akanthai" (2009), his book "The Concept of Polymediality" - published by Schott Music (2017) - illuminates Elia's concept of polymediality and, by providing a wealth of examples, how literary sources become an inherent polymedial element of his music.At the same time, the commentary elucidates a series of fundamental aspects of the music, including the model of imitative interaction, the concept of permanent fleetingness, the concept of polyaesthestics, and the question of musico-literary intermediality.