This gives me a similar feeling to when I first saw Google Maps. It's not like we didn't have flying robots before, but suddenly the bar's been raised to a new level of elegance and (retrospective) obviousness.
Black flying sphere developed by Japanese ministry of defense. Can also roll along the ground if necessary.
Imagine one of these chasing after you! Actually it was already imagined for you in 1959, since the same idea is a creepy part of the third Gormenghast book (hunch.com/item/hn_3598534/gormenghast-trilogy/).