I just saw this blind woman walking down the pavement, crossing the road and walking down the other side. She was carrying a white stick, but it was shorter than the ones that I am used to seeing. She was holding it with both hands, upright, with the top about chest height and the bottom end about at her knees. She wasn't using it to touch the ground or the side of the pavements, or walls. What was it? Did it have some kind of sensing device in it, or was she just so used to the walk that she didn't need to use it?