Alice went through one and found a whole other world. Seeing is believing, they say, but in the mirror we see our self . . . and we know it isn't us, because we're right here! Supposedly it's dangerous to place two mirrors opposite each other. I wonder, if someone made a perfect sphere with a mirrored interior, what would the reflection look like? Vampires don't show in mirrors. Leonard Wolf says it's because our own reflection gets in the way.
A interesting bit of pulp fiction werewolf lore that sadly never made it into any movies was that the werewolf's reflection is that of the form he's not in - a wolf has the reflection of a man, a man the reflection of a wolf. The question in this picture is who is reflecting whom.