From the designer's blog/portfolio:
20071201 Waveform Series, 2007
Waveform Series is the laser-cut shapes of the waveform of the sound in sound editing software environment. I used some human sound such as yawn, atchoum, giggle, wow, and the sound of church bell.
Laser cut/ hand fabricated
Sakura Koshimizu - Waveform Series 2007