For the people of Lindau, Germany, there is no such thing as keeping your mood to yourself. At least, not since German artists Julius Von Bismarck, Richard Wilhelmer, and Benjamin Maus installed a "Fuehlometer" (Feel-o-Meter), an interactive piece of public artwork that gauges and replicates the city's mood swings.

The large smiley face is set on top of a lighthouse and changes expression as the people of the city do. How it works is a digital camera set along the water takes photos of peoples' faces, which are then sent to a computer program to be analyzed. Once the mood is determined, the artwork will either show a happy, sad, or indifferent expression.

Want to see what the Feel-o-Meter looks like in action? Check out this video.

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