The acoustic elements of the work are harmonic pitch created by harmonic system written in my note on method for harmonics “LA TECHNIQUE PRATIQUE sur des harmoniques naturels et des harmoniques artificiels pour les instruments à cordes, 2015-2016”. The acoustic is constructed by double harmonics combined by double stop, or interval built of plain sound and harmonics. In the work, each part mutually interacts, and character of each language is brought into one another, and they interactively influence. The building up of several languages affects the acoustic. And this is the construction of the music.