Emotional Mirrors?

Inspired by the magic-mirror project by Dan, Noah and Sim, and their difficulties building an interface that users can intentionally use without getting false positives (changing the display by combing your hair, etc) -- I wonder if a magic mirror could be a more subtle interaction.. it could combine elements such as the beat/volume/etc of your music, the color of your clothing, tone of voice, posture, etc to display an ambient colored light.. an "emotional mirror"?

The interaction would be really subtle, but potentially engaging.

This idea is also inspired by last quarter's HCI seminar in "Reality Mining"