Do you have a car? If so, have you noticed how it has trained you to put on your seat belt? Why is that annoying (but not painful) chime used in every new car? Simple: it saves lives. An annoying sound in the quiet isolation of a car is a pretty good trainer because the sensor never sleeps and always chimes — you cannot ignore it for long.
Have you ever put on an Apple Watch? Why does it have haptic tapping? Simple: humans can ignore a great deal of low-volume sounds in a crowded world (we do it every day), but find it much more difficult to ignore even the tiniest skin tap. Haptic tapping works well to give notice, and if it is paired to a meaning, is a great trainer.
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