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I think silence is definitely not golden and actually quite elusive. Even when I'm lying awake in the middle of the night there are still noises to be heard. Our house is old so there are often creaks and groans. My hubby uses a CPAP machine which although not loud is definitely not silent. Yes if he's not there I wouldn't hear that and the house might keep quiet for a while but then occasionally a car will drive past disturbing the peace.
Of course you could argue that a house in a London suburb is not the best place to find silence but I could be in the middle of the countryside and there would still be sounds. Creature sounds that probably wouldn't all be welcome ones.
For the clever clogs out there you might suggest a vacuum or space. We've probably all heard the tagline from Alien - but I'm not sure I want to put it to the test.