@seachaint "the sky is blue" is one that seems true until you think about it for longer and realise that it isn't, as often as it is. There's a radiolab episode mentioning how a psychologist brought his kid up without ever mentioning the colour of the sky, and occasionally asked her what colour it is. And she would either refuse to answer or, say, "maybe white?" until school age when she was exposed to the common understanding of it being blue
I dunno, it seems a bit of a stretch. Here's an article about said radiolab episode: https://thesocietypages.org/socimages/2012/12/28/is-the-sky-blue/. The kid alternated between blue and white themselves without “being taught it was blue.” Which makes sense, because some days the sky is more white and other days the sky is more blue so if you ask a toddler they're going to say what it looks like right now.
I don't have an optical spectrometer on hand to confirm but the sky is pretty objectively blue today
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