Should the relationship between man and machine be defined as subordinate? The question ‘Do humans dream of machines?’ represents a negative feedback loop between human and machine. Each of the eight coolers is equipped with a miniature harmonica which generates sound when the cooler is activated. Each module has a built-in microphone, which recognizes the specific note of each harmonica. When the microphone recognizes the specified note, the fingers stop the sound by pressing the center of the cooler. If the microphone does not hear any sound, the fingers return to their original positions. By Jonghong Park