Take a blank wall in your house, setup a 2m x 2m playspace in front of it. Now imagine the game you’re playing relies on that wall for game input.
For example, a keyboard is on the wall and, with your little Oculus Touch finger pointing outward, the game registers collision between the tip and the keyboard. You’d have a physical representation of those controls; like a giant touch interface.
It’d be pretty cool to pilot a ship that way..
I realize this should be technically possible with the Rift but most folks probably aren’t playing next to a wall.