Görkem Şen performs on an acoustic instrument which has a unique resonant sound (one which many would only expect from electronic music processing) - video embedded below:

This is an acoustic instrument with no electricity or anything… Natural source coded materials which are membrane, coiled spring and string working together. Maybe we can say that this is a new bridge system between string and resonant body. But generally this is a new design and emit obviously natural vibrations and gives new playing abilities.