Despite Bangkok artist Visarute Virojanawat’s solo moniker being Impermanence, the walls he crafts are often quite tangible and even enduring, leaving behind fragments and disturbances in their formidable wake. By this I mean you can feel the forward motion of his stagnant sonic creations (paradoxical, I know), and especially on Purgatory Flows there’s a sense of weight, of gravity, of presence, that evokes the possibility of a lasting impact. “Underflow” is reserved and meditative, but also imbued with plenty of physicality, molded with grumbling crackles and a restless, kinetic clatter that provides much of the aforementioned illusion of motion. As the track progresses, this latter element almost seems to grow more prominent, its volatile textural monopolizing the sound space. This is a good lead-in to “Overflow,” which blasts into existence with a brash yet spacially contained roil of crunching noise. The track shares its predecessor’s sense of movement, but the two differ in their posture: where “Underflow” was quiet and reticent yet concealed a physical force, “Overflow” hides its insubstantiality behind a heavy curtain of distortion.