Creepy it is.
It also reminds me of crystal balls and similar tools, all of which probably evolved from ancient technique of staring into the calm water surface. Maybe it has something to do with hypnotizing oneself. As a young girl I experimented few times, but each time I got scared as soon as my reflection started to change.
And in my part of the world people used to cover mirrors when family member died. Legend says this is to prevent death from multiplying, but I suspect it is because relatively often people can see strange things in mirrors.