Disney made a multi-user treadmill that lets you walk around in VR
zdnet.com
zdnet.com
On a more serious note, the tech looks interesting, but unfortunately the article doesn’t explain at all how it works. I think the discs are rotating so as to make you slide back onto the original position?
Found the patent. Will have a read later.
https://image-ppubs.uspto.gov/dirsearch-public/print/downloa...
By mounting that disc at an angle and changing which edge makes contact with whatever rests on it (your foot in this case), you can change the direction the disc's rotation moves it.