Well it's handy to know if your phone is being held, in the car, on your desk. You can 'track' if someone glanced at notifications, doing a spaced-repetition t

Well it's handy to know if your phone is being held, in the car, on your desk. You can 'track' if someone glanced at notifications, doing a spaced-repetition type delay between glances. Or maybe you want notification when you're looking at your phone (certain angle and shakeyness). Or maybe when you're on the phone (different angle).