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It's fairly arbitrary - Phract is right about gravity. I think that if we are talking up/down from a human perspective then down is gonna be towards the sun. Any human habitation within the solar system will have to be able to protect against the solar wind and blinding light with massive and thick protection in one direction- and psychologically that will be the floor. You have windows/skylights in the walls and the ceiling but the floor is the solid reassuring lump beneath you
My friend in New Zealand and I have more or less totally opposed views on which way is "up".