Could a Matoran have discovered Metru Nui is in a dome?

Something I was wondering recently: if the mist hiding the Great Barrier and ceiling of the MU gave the illusion a normal sky, could a matoran have possibly found out that they were inside a dome? Like a Le-Metru aviator trying to see how high he could go, or a Ko-Metru scholar trying to send a probe to the stars and it just hit the ceiling? Or were they just content with their existence and didn’t ask questions?

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