Through the intervention of the natural spaces of the Ebro Delta (the beaches of the outer and inner sea and the flooded rice fields, during the period of artist residence carried out for the Lo Pati art center of les terres de l' Ebre), an old Telesforo Julve guitar over 80 years old will be placed on different natural spaces. Through the use of contact microphones and hydrophones, the sounds of the friction of the body of the guitar with the sand of the beaches, the water, the waves, the rice fields and the wind will be recorded, generating a sound file that will materialize in of videos, as final records of the performative act of landscape intervention. Some pieces that will reflect the different coefficients of friction generated by different natural elements, analyzing the landscape as a compositional element from a visual-sound perspective, just as Tarkovsky formulated in the representation of the compositional spaces of his films. 

Coefficient of friction is a project presented at the Eufònic 2016 festival (Museu de Tortosa and Arts Santa Mònica de Barcelona), based on the sonification of the films Stalker, El Espejo and Sacrificio, by the legendary Russian filmmaker Andrei Tarkovsky, where the author together with the sound work of the composer Eduard Artemeyev, make an exhibition of natural sounds and noises as creative elements without attending to the special need of the specific composition of a complementary musical soundtrack. In this way, a composition process does not appear in his work traditional musical that works as an acoustic accompaniment of the compositional space. The sonification is narrated through the action of water and the different noises that are obtained from the landscape, thus reflecting an alternative reality that does not correspond to a one-dimensional unity of the images presented. Under the influence of Tarkovsky's acoustic work, the project addresses sound as a form of poetic tune, where the composers of the auditory process are the natural elements themselves. During the realization of the project, the different processes of friction between instrument and space will be addressed, as a creative value of acoustic composition.