The active relaxation is essentially provoked by listening to the especially composed music, through the acoustic system of the chair. The music is not only perceived by the ears, but also throughout the whole body. The low frequencies put the muscles in resonance to provoke a spontaneous relaxation. Conditions of listening are exceptional and will delight audiophiles. The architecture and proportions of the chair create a feeling of total immersion in the music. The music envelops all the body and seems to come from everywhere, even at low volume. This effect of relief and depth is based on the physique of natural acoustics, as well as on the choice and the disposition of the interior coverings of the chair. All these elements improve dramatically the efficiency of short (10 to 20 minutes) relaxation musical programs.