True, communicating thoughts vocally is imprecise and slow. But hearing does have some more parallell-ness in a sense. A fire alarm is a good interface to alert

True, communicating thoughts vocally is imprecise and slow. But hearing does have some more parallell-ness in a sense. A fire alarm is a good interface to alert to a fire. It is still in the background, and you can talk to someone over it, but you are constantly aware of it.