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Imagitronics writes –

I retrofitted this generic “Blinking Traffic Light” with a USB module and wrote a simple Mac application to monitor my computer usage and reflect the results in by changing the stoplight. This project was born out of the frustration after being constanty interrupted by people who could not tell that I was already busy. The alpha version of the software detects the number of running applications on the computer using Cocoa’s NSDistributedNotificationCenter and updates the light based on a user-defined threshold.

TrafficStop – [via] Link.

Check out the poster on the wall!