concerning the system
instruments:
4x glass tubes (d:62mm l:1200mm) as observation spaces
2 x lights as heaters
4 x microphones + loudspeaker with 1 x 4ch custommade amplifiers as audio amplification

method:
setting 2 x glass tubes in the normal thermal state and 2 x tubes in the heating state. catching the internal sound at one of the glass tubes and transmitting the sound to the next space. doing this procedure over and over. as a result, the natural resonance frequencies must be emphasized. in this case, 2 sets of resonances will rise from 2 kinds of thermal states. the difference between thermal states