Round Messenger QR code.

The facebook messenger round QR codes might be useful if you printed them on a surface to give some orientation (distance?) information to the oculus rift, which might make it easier to place augmented reality objects on these surfaces, no?

You could print it in invisible infrared ink which cell phone cameras can see and place it on public buildings so the oculus can recognize them better, no?

The qr code might also transmit geometry information to correct for curved surfaces.