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How Room Designs Affect Your Work and Mood

elevated ceilings make people feel physically less constrained…higher ceilings encourage people to think more freely, which may lead them to make more abstract connections. The sense of confinement prompted by low ceilings, on the other hand, may inspire a more detailed, statistical outlook—which might be preferable under some circumstances.
natural settings, such as a garden, field or forest, actually improve focus
Adequate sunlight has also been shown to improve student outcomes.
bright light might boost cognition
students questioned in the dim room felt more relaxed, viewed the counselor more positively and shared more information about themselves than those counseled in the brighter room did. The findings suggest that dim light helps people to loosen up.

via Scientific American