This autonomous concept vacuum, called the Dust Ball, rolls about the room thanks to an internal motor that constantly shifts its center of gravity. Instant motion! Too bad the spherical shape means it can't vacuum near walls...
...or under furniture. Or near furniture, for that matter.
In fact, while it's an interesting design—one that had me daydreaming about alien housekeeping, no less—there's really no need for such a vacuum, outside of the concept and design space. [Dave Hakkens via Yanko via DVICE]