Google Working On VR Shoes That Let You Walk Forever In Your Living Room
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The patent -- titled "Augmented and/or Virtual Reality Footwear" -- describes a motorized shoe that can detect when you are running out of space to walk, activating a mechanism that will allow you to take a step in the virtual world without actually advancing in the real world (and smacking your face against a bookshelf).
The shoes, the patent abstract describes, "allow the user to walk, seemingly endlessly in the virtual environment, while remaining within a defined physical space in the physical environment." In other words, you will think you are walking for real but, from the outside, you will look like Michael Jackson moonwalking.