Researchers in Japan have developed a colored LED that changes colors based on the 'mood' of the room. The SHOJI system consists of a pair of terminals placed at separate locations with each terminal equipped with a full-color LED array, a microphone, and five sensors that detect light, temperature, humidity, infrared radiation and ultrasonic waves. In addition to constantly measuring the room's environmental conditions, SHOJI terminals can detect the presence and movement of people, body temperature, and the nature of the activity in the room. So basically they've created the world's most complex mood ring. Only not as cool because this thing is huge and won't let your girlfriend know when she's being an annoying hag.