The sheet music of Arvo Pärts 'Spiegel im Spiegel' for clarinet and piano illustrates his creative principles: above a permanent flow of chords on the piano, the clarinet unfolds acantilena in long note values, which grows out of succinct steps. This cantilena spins out sweeping, chorale-like arches and spreads itself out more and more. It thus gives rise to a new architectonic configuration which, like a mediation chapel, stimulaties reflection, prayer or the desire for redemption.