Space and time do not exist. There is always something to see, something to hear. [...] In that silent room, I heard two sounds: one high and one low. Later, I asked the sound engineer in charge why, in such a quiet room, I had heard two sounds. He said to me, "Describe them." I did. He replied, "The high sound was the workings of your nervous system. The low sound was your blood circulation." John Cage. Writings to the Ear, Carmen Pardo Salgado, 2007.