I've been thinking for some time about how to get people to walk in a virtual environment. My idea was to have a floor of rollers, like large ball bearings, with the user supported by a hanging seat, akin to those in stand-up roller coasters. The movement of the ball on the floor could then be translated into movement, like upside-down ball mice. But these researchers came up with an even better idea.
Plus, the article touches on one of my favorite new words: proprioception. Because man cannot live by exteroception alone.