Most everyone remembers mood rings, but for those who don't:"A mood ring is a ring which contains a thermochromic element, such as liquid crystal. The ring changes color in response to the body temperature of its wearer. The color is said, by some proponents, to indicate the emotional state of the wearer"-Wikipedia
I thought we should bring these back with today's technology-an LED. This time, it could actually work. If the user had a way to control it, not just it telling the user what mood it thought he/she was in. That way, you could start communicating with people in a more subtle way.
"Don't talk to so and so when his ring is purple" or "ask the boss for a raise when his ring is red only". It would be fun to figure out what everyones colors meant.
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