Unda maris 8 Extrait de Parfum 50 ml

From the Latin, "wave of the sea”, it refers to a particular register of the organ. It is a "soul” register, part of the fluctuating family. It consists in two equal pipes, one of which, however, is slightly lower than the other. 

By making them play simultaneously, the phase  displacement between the two frequencies produces a particular physical phenomenon called beating, which generates the specific “swaying" and flute-like effect of the sound.