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> This reminds me of some experiment (that I will never be able to find again)

That was from Richard Feynman.

Ah yes! That would totally line up. Guessing from his Surely You're Joking book.

Apologies to any if I butchered the story or experiment, been awhile.

It's definitely in the excellent Feynman BBC series "Fun to imagine"

I've never watched but I'll have to check it out! Must be a common story he tells haha.