ciat_lonbarde_tetrazziRastko is playing live this friday in the little cinema on Castingallee 77 in Prenzlauer Berg as Basic Electricity! He is one of the few people who likes those strange instruments by ciat lonbarde who also made that tetrazzy percussion instrument that you see in the picture. I also liked it a lot and bought two or three of them once, but they are mostly gone.
This info I got from Navs who released even more info on this here.