We never know, in the virtual reality, where fantasy ends and prescience begins. We never know whether what we take as our sheer inventions aren't actually unaware visions of someone else's reality, or whether somebody may take our own reality and turn it into fiction. We can always come to the point where we can't tell anymore whether what we see in the mirror is us or someone else - or maybe we always were the ghost of another being?! Sometimes all you have to do in order to understand things is to watch from inside the mirror's perspective. Then you realize the truth, up to the level that life and death are one and the same. Learning THAT is easy. Returning on the right side of the mirror afterward - that can be indeed a challenge. And if you don't find your way back - ah, well, you can always attempt to live the life of your reflection...or die...