On usage of empty fridges

It's been a while since we've not revisited here our favourite Tao Te Ching chapter, the one from which the title of this blog is derived. Yesterday I found it was a mandatory answer to Danny Ayers' post on Google+, quoting a quite old (2003) but still relevant post by Dan Brickley "Missing is not broken". Worth re-reading indeed, as well as Danny's comment : an empty fridge is still a fridge. And even more useful so according to 老子. The usage of a fridge is allowed by this very emptiness. Whoever came back once from the supermarket to find the fridge already full has understood that a full fridge is useless until you start to empty it. Granted, by Laozi times, fridges and supermarkets were barely concepts, but useful empty clay pots did the trick.