Unobtainium describes any hypothetical material possessing properties impossible for any real material. Through mathematical speculation, the work attempts to reproduce impossible constructions in the sound domain by the incessant metamorphosis of the initial musical entities. Altered by time, the sound texture gradually erodes until it becomes autonomous from its original form, generating along the way various games of illusion. The paradoxical relationship between immobility and movement is thus highlighted, somewhat countering Akiyoshi Kitaoka’s spinning snakes, which create the illusion of circles seeming to coil upon themselves in an absolutely fixed image.