In Peristalsis of String - Black Hole, Song adopts a familiar object in the Entropy series as his central motif: the humanoid face of the robot. It is repeated in circular orbits around the picture’s frame, producing a three-dimensional tube that leads to a central, dark void. The pattern emerges, almost chain-like, when the eye stops searching for the represented face. In this way, the reflective sheen off the robot’s skull serves to add texture and volume to the tubular digital pattern, rather than pointing to a specific visual referent.