I just came across
Freesound.org while trying to look up a particular sound that a friend posted about.
A week ago I was attending the Late Night event at the Dallas Museum of Art. One of their exhibits was all about the effects of texture and touch. Yes, it was in fact a touchy-feeling kind of exhibit. Another exhibit was about the effects of lighting, with various rooms flooded with certain lighting effects, including a huge walk-in kaleidoscope that the ushers will quickly shoo you out of if you try to touch it, even though I'm pretty sure that the artist of this piece thoroughly expects human interaction.
This web site makes me wish they also had a sound exhibit. I mean, how often do you really think about how things sound?