"As John Cage has insisted,"there's no such thing as silence. Something is always happening that makes a sound." (Cage has described how, even in a soundless chamber, he still heard at least two things: his heartbeat and the coursing of the blood in his head). Similarly there is no such thing as empty space. As long as a human eye is looking there is always something to see. To look at something that's "empty" is still to be looking, still to be seing something - if only the ghosts of one's own expectations."
