“From the celestial vault hangs a gigantic spindle, which carries in its eternal course eight orbs of varied colors. On each of these circles sits a Siren 'uttering a single note of her voice, always in the same tone.' It is through the movement of this voice that the movement of the various celestial spheres is accomplished. The sound made by the golden axle of the world, turning on itself, accompanies their hymns. 

“This concert forms the triple voice of time, which tells of the past, the present and the future, and which wise men have sometimes heard on earth by approaching a tomb during the silence of the night.

“From the side of the moon rises a sweet concert; the sounds of the sun are admirable; a voice of thunder comes from Mars, a sweet nightingale song from Jupiter."

Jean-Georges Kastner, 1858