Sound often breaks the boundary of space, but at the same time, constructs a sense of space. A microphone continuously picks up the subtle vibrations in the air, and the feedback with the speakers is continuously amplified. Through multiple units at different heights and the rules formed by mechanical motors, sensors and sounds, various pure sound waves intertwine to form a complex system. In this work, sound is not used as a narrative vehicle, reproduction or to serve other media, but to present sound itself, the composition of sound, and the relationship between sound, space and body.