In 1961, Mauricio Kagel wrote a piano piece with two titles. As a solo work, it is called “Metapiece." It can also, however, be played together – either simultaneously or in alternation – with other pieces by Kagel or other living composers, and is then called Mimetics. In this way, Kagel opens at the conceptual level various possibilities for the interpreter to realize his composition. The pianist Sabine Liebner has accepted Kagel’s invitation to collaborate and undertaken her own musical journey through the composer’s piano music. Sabine Liebner‘s response to his invitation to play with the idea of open form is unique in that she combines “Metapiece” exclusively with other piano pieces, all of them composed by Kagel himself. “Metapiece”, in its “Mimetics” form, surrounds these other works or is laid over them. Framed by “Mimetics”, the “Cuatro piezas para piano” and “MM 51” are played in their original forms, and the piano etude “An Tasten” is subverted by a version of “Mimetics”. At the end of Liebner’s response to Kagel’s original invitation, “Metapiece” itself appears in a 20-minute solo version.