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You can usually see the sky when you're outside.
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You can usually see definite walls when you're inside. If you're outside and in a place as congested with machinery and obscured with pollutants as Rupturefarms seems to be, and then placed on a 2D axis with fixed perspective then you most likely wouldn't be able to see the sky.
Inside? Yes, walls and ceilings.
Outside? Maybe, just catwalks pipes and pillars like outside Rupturefarms.