That's exactly what I thought. I stood there for half a minute looking incredibly silly trying to make it frown. My guess would be that frowns are more subtle and harder to detect.
Cute idea... but really this isn't measuring MIT's mood, but it's sociability. When people are alone, they tend to have a neutral expression regardless of their mood. This is also true in public but non-social situations like sitting on a bus or subway. Conversely, in North American culture anyway (and probably others, especially many European cultures), people tend to smile when they're talking with one another -- again, regardless of mood.
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