Imagine being able to automatically communicate whether you can be disturbed based on your own preferences.
Your brother walks in on, what appears to be you reading a web comic series: surely you're free to hear about his new Amazon purchase? WRONG!
He won't be making that mistake again thanks to the Stoplight "Can I Disturb?" Earring, which indicates whether a person can "GO" disturb you (green), stop unless there's an amulance (read:emergency) and go away (red), or approach with caution (yellow).
The light color changes automatically based on which website you're on; and you can decide which website aligns with which color, meaning no one else can decide whether your activity is "disturb-able".
Final Schematic