"Shivan" is an etude based on exploring the possibilities of using the harmonic series of the flute as the primary source of inspiration for creating a new piece and making the Iranian traditional music’s intervals and tetrachords out of the world harmonic series.     On the other hand, the piece's whole structure investigates the detailed timbral fluctuations and experiments with different techniques on the instrument. The extremely high register of the flute pushes the listening comfort zone to the limits, both for the audience and for the performer him/herself. It is an uncomfortable piece to perform or listen to, as the sound world derived from its name - Shivan - means in Persian language, Outcry.     The piece is a result of a close collaboration with flutist Mehrdad Gholami during the summer and autumn of 2020.