In three pieces happens the differently created search for close connections between the two instruments, which, despite all their similarities, show many differences. At the same time one instrument is never the companion of the other, and the three times different motifs are usually common to both. The formal rotundities of the rather heterogeneous outer movements become explicitly the topic in the homogeneous middle movement in a double sense. Central tone-like, glassy, like ocean noise, mysterious, mostly restrained and yet also bodily. Listening in the sound and fading in mainly dark, soft colorings.