That's a very good question!
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Technically aren't a lot of things just societal concepts if you think hard enough about them?
Countries, slut shaming, office hours, time zones, dress codes...
I strongly recommend Sapiens: a short story of humanity by Yuval Harari if you'd like to think about this a bit more, particulary his concept of 'myths'.
I'd guess that you'd find a summary of that chapter online without buying the whole book.
Thanks for the recommendation! I'll definitely have to check it out sometime. :D