The cardboard is a VR device where you could only see your phones display.
This uses a peppers ghost setup to let you see the real world , and the phones screen is used to overlay holograms in the space in front of you.
If you’ve ever been to DisneyLand or any place that has hologram ghosts etc, this is essentially the same principle.
And in case some are not familiar with Pepper's Ghost: https://en.wikipedia.org/wiki/Pepper%27s_ghost
The cardboard is a VR device where you could only see your phones display.
This uses a peppers ghost setup to let you see the real world , and the phones screen is used to overlay holograms in the space in front of you.
If you’ve ever been to DisneyLand or any place that has hologram ghosts etc, this is essentially the same principle.