Can a Self-Aware Moriarty Hologram be far Behind?

The one thing I thought that the Star Trek: TNG holodeck stories never adequately accounted for was how people could walk around in there without bumping into the walls. They weren't just walking in place, after all, but running through dark alleys and up stairs and whathaveyou. Well, apparently the Japanese have been puzzling over the problem, too, and have come up with a prototype solution. Behold: the CirculaFloor.