Installed in Lindau Island, Germany, the Feel-o-meter sums up the populace’s collective consciousness. Pass by with a frown, and you could slightly dampen its smile. (You wouldn’t want to do that, would you?) Via Information Aesthetics:
Fuehlometer (Feel-o-meter) by Richard Wilhelmer, Julius von Bismarck, and Benjamin Maus is a light installation consisting of a giant smiley face that reflects the average mood of the people living in the city. The average emotional value is calculated through the computational analysis of the faces of people passing a camera located in a specific part of the city.