Lucky Forward
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http://www.trnmag.com/Stories/2004/081104/Shifty_tiles_bring_walking_to_VR_Brief_081104.html
Researchers from the University of Tsukuba and ATR Media Information Research Labs in Japan have constructed a moving floor that allows the user to stay in place while walking in a virtual environment.
The device makes it possible to literally move through a virtual environment, and could be used to simulate operations like disaster evacuations, according to the researchers.