I've been playing a lot of the Animal Crossing DLC, and my first thought upon reading this prompt was, "I wonder if there's a salt lamp in Animal Crossing. Oo, a spa would be fun to design, if I ever get a tourist who wants that!"
My second thought was, "Isn't that one of those woo-woo health things, that claims to make you healthy through ions?" (After Googling, yes, but not only is the evidence for negative ions being good for your health pretty scarce, there isn't any evidence salt lamps even create them. lol)