Rolling Observation Robot

Rolling security guard robots seem to be a very popular job for robots these days.
Here is Hitachi's entry into the market:
About 2-foot tall sphere with a camera that pops out of the head like a periscope. It does not need navigation markers because it generates its own map of the building and can navigate around on its own. It uses laser sensing to create the maps and avoid running into things.
The pattern recognition software allows it to compare the scene as it does its rounds and tell you if anything has changed.

Mainichi Daily