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Any observation can be turned into an interesting question.
(lemmy.blahaj.zone)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Which set contains no elements?
Or, more in the spirit of OP's observation:
What are the fundamental rules for set theory?
You have to go more Im13andthisisdeep with it:
'When a set has no elements we call it empty. It's always unique, but contains nothing inside it. What is something else in your life that is also so simple and empty, yet utterly unique?'
Then you wait for a hundred replies, 50 listing various containers that are special to them and the other 50 telling you it's their soul that's empty.