I believe I once saw a documentary of NASA examining concepts for future, interplanetary manned spacecraft. I thought the discussion included studying the interior colors, and the importance of gradating the colors from slightly darker to lighter, from the floor to the ceiling, for psychological reasons.

Has NASA done any such studies and if so, what would be the psychological advantage in varying how light and dark the colors are?

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    $\begingroup$ I'm not quite sure on interior color as in paint however NASA has preformed extensive research on optimal lighting color for different tasks and mental states (focused, relaxed) and uses these tuned lights on the ISS.bbc.com/news/technology-20753888 $\endgroup$ – Dragongeek Jun 9 at 16:50

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