[bsbechtel]

Can't you just have a card on everyone's desk. One side is green, one side is red. If you put the red side up, it means do not disturb? I don't mean this in any way as a personal attack on you, but tech culture in general sometimes gets too focused on using technology instead of just finding a solution that works. Sometimes it's good to take a step back and ask again what the goal is.

[karmakaze]

The headphones act can be unconscious, seeking silence, whereas a card is more abstract and could have stale state. My fave is putting in earbuds, then noise-cancelling headphones, and no music. The earbuds reduce subsonic cancelling pressure.

Sometimes people are just listening to music and could be interrupted. How do we distinguish this form?

[rocketcity]

Sounds much more efficient. But who doesn't love over-engineering a solution?