This work starts from the question of how ‘presence’ can be understood. Due to the span between perception and recognition, we cannot perceive things as present. Here, I suppose that 'perception' is the pure material perception and 'recognition' is comprehension. What we recognize is just what happened in the past. During the time span between 'perception' and 'recognition', there exists only non-directional vibration of energy and color-deviation. In the interaction with spectators moving, sonic events are generated and go through audio transformation in the way that one sonic event is affected by another one, so as to explain the uncertainty of identity on basis of delay technique - comb filter.   Through this work, spectators can experience formless and vibrating energy of color and shape when they move in front of the prepared camera, and when they don't move, they can see their whole body standing just still in black and white. All this phenomenon is like formless energy of magma cooling down its temperature on earth to form itself a recognizable shape, which is same in audio processing as well. The energy that spectators can experience when they move is comparable with magma activation. Both of visual and audio events and transformation represent the theme - presence.