‘An offshoot of our calendar project, Egg is a physical, ambient interface that communicates last-minute scheduling changes. Your egg represents the time you have left until your next scheduled event. As time elapses, the light in your egg decreases. To give yourself more time to get to where you need to go, you can shake your egg, turn it upside down, and add more light. Your egg will then notify other people’s eggs that you will be late. Egg represents the discrepancy between scheduled time and real time that we’re calling “Egg Time” — the bridge between the now and the very, very soon.’

http://people.interaction-ivrea.it/j.bove/school_10.htm
http://people.interaction-ivrea.it/j.bove/school_10.htm
http://people.interaction-ivrea.it/j.bove/school_10.htm