No such thing as empty space or empty time

There is no such thing as empty space or empty time. There is always something to see, something to hear. In fact, try as we may to make silence, we cannot… Until I die there will be sounds. And they will continue following my death. One need not fear about the future of music.

John Cage, Every Day is a Good Day: The Visual Art of John Cage (Hayward Publishing, 2010) p. 61