"The VR industry," I recently mused to some friends, "has turned millennia-old philosophical thought experiments into practical business challenges." As a perect example of that, read this Rock Paper Shotgun thread where VR users report feelings of temporary confusion between what's virtual and the real:

I took off the headset and went through to the bedroom to get ready for bed. It was fine for a few minutes but then I had to go to the side of the room to get something and suddenly I felt convinced I was still in VR. Like, I was inching across the room because I was expecting the virtual grid to appear at any moment and tell me that the *real* edge of the room was imminent. If I went too fast I would walk into an unseen wall or wardrobe...

The 5 or 10 minutes after taking off the headset is a weird, sort of uncomfortable thing. I’ve noticed that it leaves me feeling drained, mentally exhausted. I fully expect to be able to phase through walls and furniture. It definitely leaves a lingering sense of altered perception but I can’t tell if it’s something that will lessen or become exacerbated after becoming well acclimated to spending more and more time in VR.