---

"Illusion d'optique" translated to music, Moiré pattern methods used on musical material, hyperbolic functions and graph theory used as composition devices. In computer music, graphs can be used to represent networks of material, sonic organization, signal processing devices, the flow of sonic material, etc. The structure of a piece of music could be represented by a directed graph. The vertices can be the musical components available at the piece and a directed edge from section A to section B exists if and only if A moves to B. A similar approach can be taken to design rhythms, beats, sound design, and controlling musical parameters. The development of musical algorithms to handle graphs is the main art in computer music. "Mirror Stage" and "Inversion And Note Range Shift" are based on the idea of musical moiré pattern.The rhythmic structures are superimposed at one point of the piece, the shift between the lines increase with passing of time. After a given number of events, the patterns are opposed: the lines of the second pattern are between the lines of the first pattern. ::::::::“AND SO SOMETHING WHICH I THOUGHT I WAS SEEING WITH MY EYES IS IN FACT GRASPED SOLELY BY THE FACULTY OF JUDGEMENT WHICH IS IN MY MIND.” - René Descartes (1596-1650)::::::::