Nice example of a 'one pixel dashbard' :-) using the Hue color as a signifier of some variable. Reminds me of the Ambient Orbs from Ambient Devices [1] (spin off from MIT's Media Lab), and more recently the blink(1) device [2]
[1] http://www.ambientdevices.com/about/consumer-devices
[2] http://blink1.thingm.com/