[quote=@TheSovereignGrave]
<Snipped quote by Lauder>

Huh, interesting. I was not aware of that fact.
[/quote]

Honestly, the impact on mood in general is a really cool thing about sound... and light... and our senses in general, really. It's all the little things that help make an environment a place you want to stay in.

For instance, I just wrote a research paper on the effects of light on fear, and my research had my stumbling into a lot of stuff on how different kinds of light can increase or decrease anxiety, or how street lights reduce fear of crime even when they don't reduce crime itself. It's pretty neat stuff. (Fun fact, though: fluorescent lights are apparently shit for your mood / stress. IIRC they make you feel drained.)