As part of the project WITHIN, Tarek Atoui has developed nine new instruments and a sound massage kit which expanded notions of hearing, beyond orality and are activated on the occasion of concerts and exhibitions.

The SubBass Prototone is a 2 x 2 x 2 m organ pipe that one can enter and play from inside. Designed by Johannes Goebel in the 1980s, it is a giant a Helmholtz resonator and the frequency range of this analog wind machine is at the bottom end of hearing, where one can only experience sound by feeling it with the hands or the body. Helmholtz resonance is the phenomenon of air resonance in a cavity, such as when one blows across the top of an empty bottle. The name comes from a device created in the 1850s by Hermann von Helmholtz, the Helmholtz resonator, which he used to identify the various frequencies or musical pitches present in music and other complex sounds. ¹