We got our first look at Japan's Defense Ministry's spherical flying machine earlier this year, but at a recent technology expo in Tokyo the hovering ball got the full coming-out treatment, complete with public demos eliciting "ooohs" and "aaaahs." The video below shows the drone doing everything it was designed to do: zipping around omnidirectionally, rolling across the floor, and staying aloft even when it strikes--or is struck by--an obstacle.