Robot vacuum cleaners seem to be going through a shape evolution. The very first ones were little more than fancy and thick cylinders that roamed around your house cleaning almost every nook and cranny. Them some got classier and started sporting a more industrial, box-type body. Now someone is trying to go with a triangle. Yes, Pananosic's upcoming Rulo robot vacuum cleaner has a rather odd triangular chassis, but don't be so quick to pan that as a gimmick, as it has been thoughtfully designed to reach even corners.