An IKEA lamp becomes a Natural Interaction system which senses human emotional states through facial expression.
It uses OpenCV for image processing and analysis to identify emotional state through the movements of face's fiducial points.
The lamp, made with Arduino, change its color to represent the user's current emotion.
Published paper:
http://link.springer.com/chapter/10.1007/978-3-319-23231-7_1...
http://arxiv.org/abs/1505.04260